diff --git a/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/DiscussionController.java b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/DiscussionController.java
new file mode 100644
index 0000000..c9b1662
--- /dev/null
+++ b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/DiscussionController.java
@@ -0,0 +1,82 @@
+package xyz.playedu.api.controller.backend.jc;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+import xyz.playedu.common.types.JsonResponse;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Discussion;
+import xyz.playedu.jc.service.IDiscussionService;
+
+import java.util.HashMap;
+import java.util.List;
+
+/**
+ * 讨论管理 后台接口
+ */
+@RestController
+@RequestMapping("/backend/v1/jc/discussion")
+public class DiscussionController {
+
+    @Autowired
+    private IDiscussionService discussionService;
+
+    /**
+     * 分页列表
+     * GET /backend/v1/jc/discussion/index
+     */
+    @GetMapping("/index")
+    public JsonResponse index(@RequestParam HashMap<String, Object> params) {
+        PaginationResult<Discussion> result = discussionService.paginate(params);
+        return JsonResponse.data(result);
+    }
+
+    /**
+     * 全量列表（慎用，只在数据量不大时使用）
+     * GET /backend/v1/jc/discussion/list
+     */
+    @GetMapping("/list")
+    public JsonResponse list() {
+        List<Discussion> list = discussionService.list();
+        return JsonResponse.data(list);
+    }
+
+    /**
+     * 详情
+     * GET /backend/v1/jc/discussion/{id}
+     */
+    @GetMapping("/{id}")
+    public JsonResponse detail(@PathVariable("id") Integer id) {
+        Discussion one = discussionService.getById(id);
+        return JsonResponse.data(one);
+    }
+
+    /**
+     * 新增讨论
+     * POST /backend/v1/jc/discussion
+     */
+    @PostMapping
+    public JsonResponse create(@RequestBody Discussion discussion) {
+        discussionService.save(discussion);
+        return JsonResponse.success();
+    }
+
+    /**
+     * 修改讨论
+     * PUT /backend/v1/jc/discussion
+     */
+    @PutMapping
+    public JsonResponse update(@RequestBody Discussion discussion) {
+        discussionService.updateById(discussion);
+        return JsonResponse.success();
+    }
+
+    /**
+     * 删除讨论
+     * DELETE /backend/v1/jc/discussion/{id}
+     */
+    @DeleteMapping("/{id}")
+    public JsonResponse delete(@PathVariable("id") Integer id) {
+        discussionService.removeById(id);
+        return JsonResponse.success();
+    }
+}
diff --git a/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/DiscussionDetailController.java b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/DiscussionDetailController.java
new file mode 100644
index 0000000..a271d8e
--- /dev/null
+++ b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/DiscussionDetailController.java
@@ -0,0 +1,69 @@
+package xyz.playedu.api.controller.backend.jc;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+import xyz.playedu.common.annotation.Log;
+import xyz.playedu.common.constant.BusinessTypeConstant;
+import xyz.playedu.common.types.JsonResponse;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.DiscussionDetail;
+import xyz.playedu.jc.service.IDiscussionDetailService;
+
+import java.util.HashMap;
+import java.util.List;
+
+/**
+ * 讨论明细管理
+ */
+@RestController
+@RequestMapping("/backend/v1/jc/discussion-detail")
+public class DiscussionDetailController {
+
+    @Autowired
+    private IDiscussionDetailService discussionDetailService;
+
+    /** 分页列表 */
+    @GetMapping("/index")
+    public JsonResponse index(@RequestParam HashMap<String, Object> params) {
+        PaginationResult<DiscussionDetail> result = discussionDetailService.paginate(params);
+        return JsonResponse.data(result);
+    }
+
+    /** 全量列表 */
+    @GetMapping("/list")
+    public JsonResponse list() {
+        List<DiscussionDetail> list = discussionDetailService.list();
+        return JsonResponse.data(list);
+    }
+
+    /** 详情 */
+    @GetMapping("/{id}")
+    public JsonResponse detail(@PathVariable("id") Integer id) {
+        DiscussionDetail detail = discussionDetailService.getById(id);
+        return JsonResponse.data(detail);
+    }
+
+    /** 新增 */
+    @Log(title = "新增讨论明细", businessType = BusinessTypeConstant.INSERT)
+    @PostMapping
+    public JsonResponse store(@RequestBody DiscussionDetail detail) {
+        discussionDetailService.save(detail);
+        return JsonResponse.success();
+    }
+
+    /** 修改 */
+    @Log(title = "修改讨论明细", businessType = BusinessTypeConstant.UPDATE)
+    @PutMapping
+    public JsonResponse update(@RequestBody DiscussionDetail detail) {
+        discussionDetailService.updateById(detail);
+        return JsonResponse.success();
+    }
+
+    /** 删除 */
+    @Log(title = "删除讨论明细", businessType = BusinessTypeConstant.DELETE)
+    @DeleteMapping("/{id}")
+    public JsonResponse destroy(@PathVariable("id") Integer id) {
+        discussionDetailService.removeById(id);
+        return JsonResponse.success();
+    }
+}
diff --git a/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/KnowledgeController.java b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/KnowledgeController.java
new file mode 100644
index 0000000..345a7e9
--- /dev/null
+++ b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/KnowledgeController.java
@@ -0,0 +1,69 @@
+package xyz.playedu.api.controller.backend.jc;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+import xyz.playedu.common.annotation.Log;
+import xyz.playedu.common.constant.BusinessTypeConstant;
+import xyz.playedu.common.types.JsonResponse;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Knowledge;
+import xyz.playedu.jc.service.IKnowledgeService;
+
+import java.util.HashMap;
+import java.util.List;
+
+/**
+ * 知识点管理
+ */
+@RestController
+@RequestMapping("/backend/v1/jc/knowledge")
+public class KnowledgeController {
+
+    @Autowired
+    private IKnowledgeService knowledgeService;
+
+    /** 分页列表 */
+    @GetMapping("/index")
+    public JsonResponse index(@RequestParam HashMap<String, Object> params) {
+        PaginationResult<Knowledge> result = knowledgeService.paginate(params);
+        return JsonResponse.data(result);
+    }
+
+    /** 全量列表 */
+    @GetMapping("/list")
+    public JsonResponse list() {
+        List<Knowledge> list = knowledgeService.list();
+        return JsonResponse.data(list);
+    }
+
+    /** 详情 */
+    @GetMapping("/{id}")
+    public JsonResponse detail(@PathVariable("id") Integer id) {
+        Knowledge one = knowledgeService.getById(id);
+        return JsonResponse.data(one);
+    }
+
+    /** 新增 */
+    @Log(title = "新增知识点", businessType = BusinessTypeConstant.INSERT)
+    @PostMapping
+    public JsonResponse store(@RequestBody Knowledge knowledge) {
+        knowledgeService.save(knowledge);
+        return JsonResponse.success();
+    }
+
+    /** 修改 */
+    @Log(title = "修改知识点", businessType = BusinessTypeConstant.UPDATE)
+    @PutMapping
+    public JsonResponse update(@RequestBody Knowledge knowledge) {
+        knowledgeService.updateById(knowledge);
+        return JsonResponse.success();
+    }
+
+    /** 删除 */
+    @Log(title = "删除知识点", businessType = BusinessTypeConstant.DELETE)
+    @DeleteMapping("/{id}")
+    public JsonResponse destroy(@PathVariable("id") Integer id) {
+        knowledgeService.removeById(id);
+        return JsonResponse.success();
+    }
+}
diff --git a/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/NoteController.java b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/NoteController.java
new file mode 100644
index 0000000..0842e15
--- /dev/null
+++ b/app/api/playedu-api/src/main/java/xyz/playedu/api/controller/backend/jc/NoteController.java
@@ -0,0 +1,69 @@
+package xyz.playedu.api.controller.backend.jc;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+import xyz.playedu.common.annotation.Log;
+import xyz.playedu.common.constant.BusinessTypeConstant;
+import xyz.playedu.common.types.JsonResponse;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Note;
+import xyz.playedu.jc.service.INoteService;
+
+import java.util.HashMap;
+import java.util.List;
+
+/**
+ * 笔记管理
+ */
+@RestController
+@RequestMapping("/backend/v1/jc/note")
+public class NoteController {
+
+    @Autowired
+    private INoteService noteService;
+
+    /** 笔记分页列表 */
+    @GetMapping("/index")
+    public JsonResponse index(@RequestParam HashMap<String, Object> params) {
+        PaginationResult<Note> result = noteService.paginate(params);
+        return JsonResponse.data(result);
+    }
+
+    /** 全量列表（慎用） */
+    @GetMapping("/list")
+    public JsonResponse list() {
+        List<Note> list = noteService.list();
+        return JsonResponse.data(list);
+    }
+
+    /** 笔记详情 */
+    @GetMapping("/{id}")
+    public JsonResponse detail(@PathVariable("id") Integer id) {
+        Note note = noteService.getById(id);
+        return JsonResponse.data(note);
+    }
+
+    /** 新增笔记 */
+    @Log(title = "新增笔记", businessType = BusinessTypeConstant.INSERT)
+    @PostMapping
+    public JsonResponse store(@RequestBody Note note) {
+        noteService.save(note);
+        return JsonResponse.success();
+    }
+
+    /** 修改笔记 */
+    @Log(title = "修改笔记", businessType = BusinessTypeConstant.UPDATE)
+    @PutMapping
+    public JsonResponse update(@RequestBody Note note) {
+        noteService.updateById(note);
+        return JsonResponse.success();
+    }
+
+    /** 删除笔记 */
+    @Log(title = "删除笔记", businessType = BusinessTypeConstant.DELETE)
+    @DeleteMapping("/{id}")
+    public JsonResponse destroy(@PathVariable("id") Integer id) {
+        noteService.removeById(id);
+        return JsonResponse.success();
+    }
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Discussion.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Discussion.java
new file mode 100644
index 0000000..2f5a3dc
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Discussion.java
@@ -0,0 +1,70 @@
+package xyz.playedu.jc.domain;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.util.Date;
+
+/**
+ * 讨论表
+ * 对应表：jc_discussion
+ */
+@Data
+@TableName("jc_discussion")
+public class Discussion {
+
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+
+    /** 教材ID */
+    @TableField("book_id")
+    private Integer bookId;
+
+    /** 章节ID */
+    @TableField("chapter_id")
+    private Integer chapterId;
+
+    /** 父级讨论ID（顶级为0或null） */
+    @TableField("parent_id")
+    private Integer parentId;
+
+    /** 发起人用户ID */
+    @TableField("user_id")
+    private Integer userId;
+
+    /** 讨论内容 */
+    @TableField("content")
+    private String content;
+
+    /** 点赞数 */
+    @TableField("like_num")
+    private Integer likeNum;
+
+    /** 回复数 */
+    @TableField("reply_num")
+    private Integer replyNum;
+
+    /** 状态：1-正常 0-删除/屏蔽 */
+    @TableField("status")
+    private Integer status;
+
+    /** 创建人（可以是用户名） */
+    @TableField("creator")
+    private String creator;
+
+    /** 更新人 */
+    @TableField("updater")
+    private String updater;
+
+    @TableField("create_time")
+    private Date createTime;
+
+    @TableField("update_time")
+    private Date updateTime;
+
+    @TableField("tenant_id")
+    private String tenantId;
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/DiscussionDetail.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/DiscussionDetail.java
new file mode 100644
index 0000000..804198a
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/DiscussionDetail.java
@@ -0,0 +1,64 @@
+package xyz.playedu.jc.domain;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.util.Date;
+
+/**
+ * 课程讨论明细
+ * 对应表：jc_discussion_detail
+ */
+@Data
+@TableName("jc_discussion_detail")
+public class DiscussionDetail {
+
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+
+    /** 教材主键 */
+    @TableField("book_id")
+    private Integer bookId;
+
+    /** 章节id */
+    @TableField("chapter_id")
+    private Integer chapterId;
+
+    /** 讨论id（主讨论记录） */
+    @TableField("dis_id")
+    private Integer disId;
+
+    /** 用户主键 */
+    @TableField("user_id")
+    private Integer userId;
+
+    /** 等级（楼层/层级） */
+    @TableField("level")
+    private Integer level;
+
+    /** 回复id（被回复的那条记录ID） */
+    @TableField("reply_id")
+    private Integer replyId;
+
+    /** 讨论内容 */
+    @TableField("content")
+    private String content;
+
+    @TableField("create_time")
+    private Date createTime;
+
+    @TableField("update_time")
+    private Date updateTime;
+
+    @TableField("creator")
+    private String creator;
+
+    @TableField("updater")
+    private String updater;
+
+    @TableField("tenant_id")
+    private String tenantId;
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Knowledge.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Knowledge.java
new file mode 100644
index 0000000..50f4d89
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Knowledge.java
@@ -0,0 +1,72 @@
+package xyz.playedu.jc.domain;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.util.Date;
+
+/**
+ * 知识点表
+ * 对应表：jc_knowledge
+ */
+@Data
+@TableName("jc_knowledge")
+public class Knowledge {
+
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+
+    /** 教材ID */
+    @TableField("book_id")
+    private Integer bookId;
+
+    /** 父节点ID */
+    @TableField("parent_id")
+    private Integer parentId;
+
+    /** 知识点名称 */
+    @TableField("name")
+    private String name;
+
+    /** 知识点code（字段名拼写为 konwledge_code） */
+    @TableField("konwledge_code")
+    private String konwledgeCode;
+
+    /** 知识点介绍 */
+    @TableField("desc")
+    private String desc;
+
+    /** 层级 */
+    @TableField("level")
+    private String level;
+
+    /** 知识点类型 */
+    @TableField("type")
+    private String type;
+
+    /** 当前层级排序 */
+    @TableField("order_num")
+    private Integer orderNum;
+
+    /** 预留JSON */
+    @TableField("extra_json")
+    private String extraJson;
+
+    @TableField("create_time")
+    private Date createTime;
+
+    @TableField("update_time")
+    private Date updateTime;
+
+    @TableField("creator")
+    private String creator;
+
+    @TableField("updater")
+    private String updater;
+
+    @TableField("tenant_id")
+    private String tenantId;
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Note.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Note.java
new file mode 100644
index 0000000..e445c2b
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/domain/Note.java
@@ -0,0 +1,68 @@
+package xyz.playedu.jc.domain;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.util.Date;
+
+/**
+ * 学员笔记
+ * 对应表：jc_note
+ */
+@Data
+@TableName("jc_note")
+public class Note {
+
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+
+    /** 教材主键 */
+    @TableField("book_id")
+    private Integer bookId;
+
+    /** 用户主键 */
+    @TableField("user_id")
+    private Integer userId;
+
+    /** 章节ID */
+    @TableField("chapter_id")
+    private Integer chapterId;
+
+    /** 笔记内容 */
+    @TableField("content")
+    private String content;
+
+    /** 笔记标记内容（高亮的那句/那段文本） */
+    @TableField("txt")
+    private String txt;
+
+    /** 所属内容ID（页面中某一块内容的ID） */
+    @TableField("section_id")
+    private String sectionId;
+
+    /** 所属原始内容ID */
+    @TableField("section_origin_id")
+    private String sectionOriginId;
+
+    /** 存储笔记信息的JSON（位置信息等） */
+    @TableField("extra_json")
+    private String extraJson;
+
+    @TableField("create_time")
+    private Date createTime;
+
+    @TableField("update_time")
+    private Date updateTime;
+
+    @TableField("creator")
+    private String creator;
+
+    @TableField("updater")
+    private String updater;
+
+    @TableField("tenant_id")
+    private String tenantId;
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/DiscussionDetailMapper.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/DiscussionDetailMapper.java
new file mode 100644
index 0000000..ce0a2ae
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/DiscussionDetailMapper.java
@@ -0,0 +1,10 @@
+package xyz.playedu.jc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import xyz.playedu.jc.domain.DiscussionDetail;
+
+/**
+ * 讨论明细 Mapper
+ */
+public interface DiscussionDetailMapper extends BaseMapper<DiscussionDetail> {
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/DiscussionMapper.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/DiscussionMapper.java
new file mode 100644
index 0000000..61d47b1
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/DiscussionMapper.java
@@ -0,0 +1,10 @@
+package xyz.playedu.jc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import xyz.playedu.jc.domain.Discussion;
+
+/**
+ * 讨论 Mapper
+ */
+public interface DiscussionMapper extends BaseMapper<Discussion> {
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/KnowledgeMapper.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/KnowledgeMapper.java
new file mode 100644
index 0000000..bb89bad
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/KnowledgeMapper.java
@@ -0,0 +1,10 @@
+package xyz.playedu.jc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import xyz.playedu.jc.domain.Knowledge;
+
+/**
+ * 知识点 Mapper
+ */
+public interface KnowledgeMapper extends BaseMapper<Knowledge> {
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/NoteMapper.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/NoteMapper.java
new file mode 100644
index 0000000..f7b8781
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/mapper/NoteMapper.java
@@ -0,0 +1,10 @@
+package xyz.playedu.jc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import xyz.playedu.jc.domain.Note;
+
+/**
+ * 笔记 Mapper
+ */
+public interface NoteMapper extends BaseMapper<Note> {
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IDiscussionDetailService.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IDiscussionDetailService.java
new file mode 100644
index 0000000..b5581f1
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IDiscussionDetailService.java
@@ -0,0 +1,15 @@
+package xyz.playedu.jc.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.DiscussionDetail;
+
+import java.util.HashMap;
+
+/**
+ * 讨论明细 Service
+ */
+public interface IDiscussionDetailService extends IService<DiscussionDetail> {
+
+    PaginationResult<DiscussionDetail> paginate(HashMap<String, Object> params);
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IDiscussionService.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IDiscussionService.java
new file mode 100644
index 0000000..6b8bd71
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IDiscussionService.java
@@ -0,0 +1,19 @@
+package xyz.playedu.jc.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Discussion;
+
+import java.util.HashMap;
+
+/**
+ * 讨论 Service
+ */
+public interface IDiscussionService extends IService<Discussion> {
+
+    /**
+     * 分页查询讨论列表
+     * 支持按教材、章节、用户等条件过滤
+     */
+    PaginationResult<Discussion> paginate(HashMap<String, Object> params);
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IKnowledgeService.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IKnowledgeService.java
new file mode 100644
index 0000000..c1d9430
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/IKnowledgeService.java
@@ -0,0 +1,15 @@
+package xyz.playedu.jc.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Knowledge;
+
+import java.util.HashMap;
+
+/**
+ * 知识点 Service
+ */
+public interface IKnowledgeService extends IService<Knowledge> {
+
+    PaginationResult<Knowledge> paginate(HashMap<String, Object> params);
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/INoteService.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/INoteService.java
new file mode 100644
index 0000000..2f2d081
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/INoteService.java
@@ -0,0 +1,15 @@
+package xyz.playedu.jc.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Note;
+
+import java.util.HashMap;
+
+/**
+ * 笔记 Service
+ */
+public interface INoteService extends IService<Note> {
+
+    PaginationResult<Note> paginate(HashMap<String, Object> params);
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/DiscussionDetailServiceImpl.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/DiscussionDetailServiceImpl.java
new file mode 100644
index 0000000..198c2da
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/DiscussionDetailServiceImpl.java
@@ -0,0 +1,80 @@
+package xyz.playedu.jc.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.collections4.MapUtils;
+import org.springframework.stereotype.Service;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.DiscussionDetail;
+import xyz.playedu.jc.mapper.DiscussionDetailMapper;
+import xyz.playedu.jc.service.IDiscussionDetailService;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+/**
+ * 讨论明细 Service 实现
+ */
+@Slf4j
+@Service
+public class DiscussionDetailServiceImpl
+        extends ServiceImpl<DiscussionDetailMapper, DiscussionDetail>
+        implements IDiscussionDetailService {
+
+    @Override
+    public PaginationResult<DiscussionDetail> paginate(HashMap<String, Object> params) {
+        try {
+            Integer page = MapUtils.getInteger(params, "page", 1);
+            Integer size = MapUtils.getInteger(params, "size", 10);
+
+            Page<DiscussionDetail> pageParam = new Page<>(page, size);
+            LambdaQueryWrapper<DiscussionDetail> queryWrapper = new LambdaQueryWrapper<>();
+
+            Integer bookId = MapUtils.getInteger(params, "bookId");
+            if (bookId != null) {
+                queryWrapper.eq(DiscussionDetail::getBookId, bookId);
+            }
+
+            Integer chapterId = MapUtils.getInteger(params, "chapterId");
+            if (chapterId != null) {
+                queryWrapper.eq(DiscussionDetail::getChapterId, chapterId);
+            }
+
+            Integer disId = MapUtils.getInteger(params, "disId");
+            if (disId != null) {
+                queryWrapper.eq(DiscussionDetail::getDisId, disId);
+            }
+
+            Integer userId = MapUtils.getInteger(params, "userId");
+            if (userId != null) {
+                queryWrapper.eq(DiscussionDetail::getUserId, userId);
+            }
+
+            queryWrapper.orderByAsc(DiscussionDetail::getCreateTime);
+
+            IPage<DiscussionDetail> pageResult = this.page(pageParam, queryWrapper);
+
+            Long total = pageResult.getTotal();
+            PaginationResult<DiscussionDetail> result = new PaginationResult<>();
+            result.setData(pageResult.getRecords());
+            result.setTotal(total);
+            result.setCurrent(page);
+            result.setSize(size);
+            result.setPages((total + size - 1) / size);
+
+            return result;
+        } catch (Exception e) {
+            log.error("分页查询讨论明细失败，参数：{}", params, e);
+            PaginationResult<DiscussionDetail> emptyResult = new PaginationResult<>();
+            emptyResult.setData(new ArrayList<>());
+            emptyResult.setTotal(0L);
+            emptyResult.setCurrent(MapUtils.getInteger(params, "page", 1));
+            emptyResult.setSize(MapUtils.getInteger(params, "size", 10));
+            emptyResult.setPages(0L);
+            return emptyResult;
+        }
+    }
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/DiscussionServiceImpl.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/DiscussionServiceImpl.java
new file mode 100644
index 0000000..ec85378
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/DiscussionServiceImpl.java
@@ -0,0 +1,87 @@
+package xyz.playedu.jc.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.collections4.MapUtils;
+import org.springframework.stereotype.Service;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Discussion;
+import xyz.playedu.jc.mapper.DiscussionMapper;
+import xyz.playedu.jc.service.IDiscussionService;
+
+import java.util.HashMap;
+
+/**
+ * 讨论 Service 实现
+ */
+@Slf4j
+@Service
+public class DiscussionServiceImpl
+        extends ServiceImpl<DiscussionMapper, Discussion>
+        implements IDiscussionService {
+
+    @Override
+    public PaginationResult<Discussion> paginate(HashMap<String, Object> params) {
+        try {
+            // 分页参数，默认第1页，每页10条
+            Integer page = MapUtils.getInteger(params, "page", 1);
+            Integer size = MapUtils.getInteger(params, "size", 10);
+
+            Page<Discussion> pageParam = new Page<>(page, size);
+            LambdaQueryWrapper<Discussion> queryWrapper = new LambdaQueryWrapper<>();
+
+            // 按教材筛选
+            Integer bookId = MapUtils.getInteger(params, "bookId");
+            if (bookId != null) {
+                queryWrapper.eq(Discussion::getBookId, bookId);
+            }
+
+            // 按章节筛选
+            Integer chapterId = MapUtils.getInteger(params, "chapterId");
+            if (chapterId != null) {
+                queryWrapper.eq(Discussion::getChapterId, chapterId);
+            }
+
+            // 按用户筛选
+            Integer userId = MapUtils.getInteger(params, "userId");
+            if (userId != null) {
+                queryWrapper.eq(Discussion::getUserId, userId);
+            }
+
+            // 按状态筛选
+            Integer status = MapUtils.getInteger(params, "status");
+            if (status != null) {
+                queryWrapper.eq(Discussion::getStatus, status);
+            }
+
+            // 简单内容模糊查询（如果你想要）
+            String keyword = MapUtils.getString(params, "keyword");
+            if (keyword != null && !keyword.isEmpty()) {
+                queryWrapper.like(Discussion::getContent, keyword);
+            }
+
+            // 按创建时间倒序
+            queryWrapper.orderByDesc(Discussion::getCreateTime);
+
+            IPage<Discussion> pageResult = this.page(pageParam, queryWrapper);
+
+            Long total = pageResult.getTotal();
+            Long pages = (total + size - 1) / size;
+
+            PaginationResult<Discussion> result = new PaginationResult<>();
+            result.setData(pageResult.getRecords());
+            result.setTotal(total);
+            result.setCurrent(page);
+            result.setSize(size);
+            result.setPages(pages);
+
+            return result;
+        } catch (Exception e) {
+            log.error("分页查询讨论失败，参数：{}", params, e);
+            return new PaginationResult<>();
+        }
+    }
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/KnowledgeServiceImpl.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/KnowledgeServiceImpl.java
new file mode 100644
index 0000000..77cc5cd
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/KnowledgeServiceImpl.java
@@ -0,0 +1,75 @@
+package xyz.playedu.jc.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.collections4.MapUtils;
+import org.springframework.stereotype.Service;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Knowledge;
+import xyz.playedu.jc.mapper.KnowledgeMapper;
+import xyz.playedu.jc.service.IKnowledgeService;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+/**
+ * 知识点 Service 实现
+ */
+@Slf4j
+@Service
+public class KnowledgeServiceImpl
+        extends ServiceImpl<KnowledgeMapper, Knowledge>
+        implements IKnowledgeService {
+
+    @Override
+    public PaginationResult<Knowledge> paginate(HashMap<String, Object> params) {
+        try {
+            Integer page = MapUtils.getInteger(params, "page", 1);
+            Integer size = MapUtils.getInteger(params, "size", 10);
+
+            Page<Knowledge> pageParam = new Page<>(page, size);
+            LambdaQueryWrapper<Knowledge> queryWrapper = new LambdaQueryWrapper<>();
+
+            Integer bookId = MapUtils.getInteger(params, "bookId");
+            if (bookId != null) {
+                queryWrapper.eq(Knowledge::getBookId, bookId);
+            }
+
+            Integer parentId = MapUtils.getInteger(params, "parentId");
+            if (parentId != null) {
+                queryWrapper.eq(Knowledge::getParentId, parentId);
+            }
+
+            String name = MapUtils.getString(params, "name");
+            if (name != null && !name.isEmpty()) {
+                queryWrapper.like(Knowledge::getName, name);
+            }
+
+            queryWrapper.orderByAsc(Knowledge::getOrderNum);
+
+            IPage<Knowledge> pageResult = this.page(pageParam, queryWrapper);
+
+            Long total = pageResult.getTotal();
+            PaginationResult<Knowledge> result = new PaginationResult<>();
+            result.setData(pageResult.getRecords());
+            result.setTotal(total);
+            result.setCurrent(page);
+            result.setSize(size);
+            result.setPages((total + size - 1) / size);
+
+            return result;
+        } catch (Exception e) {
+            log.error("分页查询知识点失败，参数：{}", params, e);
+            PaginationResult<Knowledge> emptyResult = new PaginationResult<>();
+            emptyResult.setData(new ArrayList<>());
+            emptyResult.setTotal(0L);
+            emptyResult.setCurrent(MapUtils.getInteger(params, "page", 1));
+            emptyResult.setSize(MapUtils.getInteger(params, "size", 10));
+            emptyResult.setPages(0L);
+            return emptyResult;
+        }
+    }
+}
diff --git a/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/NoteServiceImpl.java b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/NoteServiceImpl.java
new file mode 100644
index 0000000..5808af5
--- /dev/null
+++ b/app/api/playedu-course/src/main/java/xyz/playedu/jc/service/impl/NoteServiceImpl.java
@@ -0,0 +1,74 @@
+package xyz.playedu.jc.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.collections4.MapUtils;
+import org.springframework.stereotype.Service;
+import xyz.playedu.common.types.paginate.PaginationResult;
+import xyz.playedu.jc.domain.Note;
+import xyz.playedu.jc.mapper.NoteMapper;
+import xyz.playedu.jc.service.INoteService;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+/**
+ * 笔记 Service 实现
+ */
+@Slf4j
+@Service
+public class NoteServiceImpl extends ServiceImpl<NoteMapper, Note> implements INoteService {
+
+    @Override
+    public PaginationResult<Note> paginate(HashMap<String, Object> params) {
+        try {
+            Integer page = MapUtils.getInteger(params, "page", 1);
+            Integer size = MapUtils.getInteger(params, "size", 10);
+
+            Page<Note> pageParam = new Page<>(page, size);
+            LambdaQueryWrapper<Note> queryWrapper = new LambdaQueryWrapper<>();
+
+            Integer bookId = MapUtils.getInteger(params, "bookId");
+            if (bookId != null) {
+                queryWrapper.eq(Note::getBookId, bookId);
+            }
+
+            Integer chapterId = MapUtils.getInteger(params, "chapterId");
+            if (chapterId != null) {
+                queryWrapper.eq(Note::getChapterId, chapterId);
+            }
+
+            Integer userId = MapUtils.getInteger(params, "userId");
+            if (userId != null) {
+                queryWrapper.eq(Note::getUserId, userId);
+            }
+
+            // 按创建时间倒序
+            queryWrapper.orderByDesc(Note::getCreateTime);
+
+            IPage<Note> pageResult = this.page(pageParam, queryWrapper);
+
+            Long total = pageResult.getTotal();
+            PaginationResult<Note> result = new PaginationResult<>();
+            result.setData(pageResult.getRecords());
+            result.setTotal(total);
+            result.setCurrent(page);
+            result.setSize(size);
+            result.setPages((total + size - 1) / size);
+
+            return result;
+        } catch (Exception e) {
+            log.error("分页查询笔记失败，参数：{}", params, e);
+            PaginationResult<Note> emptyResult = new PaginationResult<>();
+            emptyResult.setData(new ArrayList<>());
+            emptyResult.setTotal(0L);
+            emptyResult.setCurrent(MapUtils.getInteger(params, "page", 1));
+            emptyResult.setSize(MapUtils.getInteger(params, "size", 10));
+            emptyResult.setPages(0L);
+            return emptyResult;
+        }
+    }
+}
diff --git a/app/api/playedu-course/src/main/resources/mapper/jc/DiscussionDetailMapper.xml b/app/api/playedu-course/src/main/resources/mapper/jc/DiscussionDetailMapper.xml
new file mode 100644
index 0000000..9462c92
--- /dev/null
+++ b/app/api/playedu-course/src/main/resources/mapper/jc/DiscussionDetailMapper.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="xyz.playedu.jc.mapper.DiscussionDetailMapper">
+
+    <resultMap id="DiscussionDetailResultMap" type="xyz.playedu.jc.domain.DiscussionDetail">
+        <id     column="id"          property="id"/>
+        <result column="book_id"     property="bookId"/>
+        <result column="chapter_id"  property="chapterId"/>
+        <result column="dis_id"      property="disId"/>
+        <result column="user_id"     property="userId"/>
+        <result column="level"       property="level"/>
+        <result column="reply_id"    property="replyId"/>
+        <result column="content"     property="content"/>
+        <result column="create_time" property="createTime"/>
+        <result column="update_time" property="updateTime"/>
+        <result column="creator"     property="creator"/>
+        <result column="updater"     property="updater"/>
+        <result column="tenant_id"   property="tenantId"/>
+    </resultMap>
+
+    <sql id="Base_Column_List">
+        id,
+        book_id,
+        chapter_id,
+        dis_id,
+        user_id,
+        level,
+        reply_id,
+        content,
+        create_time,
+        update_time,
+        creator,
+        updater,
+        tenant_id
+    </sql>
+
+</mapper>
diff --git a/app/api/playedu-course/src/main/resources/mapper/jc/DiscussionMapper.xml b/app/api/playedu-course/src/main/resources/mapper/jc/DiscussionMapper.xml
new file mode 100644
index 0000000..c3847f1
--- /dev/null
+++ b/app/api/playedu-course/src/main/resources/mapper/jc/DiscussionMapper.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="xyz.playedu.jc.mapper.DiscussionMapper">
+
+    <!--
+        目前使用 MyBatis-Plus 的通用 CRUD，这里可以先留空。
+        如果后续有复杂查询，可以在这里新增 <select> / <update> 等。
+    -->
+
+</mapper>
diff --git a/app/api/playedu-course/src/main/resources/mapper/jc/KnowledgeMapper.xml b/app/api/playedu-course/src/main/resources/mapper/jc/KnowledgeMapper.xml
new file mode 100644
index 0000000..a187dab
--- /dev/null
+++ b/app/api/playedu-course/src/main/resources/mapper/jc/KnowledgeMapper.xml
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="xyz.playedu.jc.mapper.KnowledgeMapper">
+
+    <resultMap id="KnowledgeResultMap" type="xyz.playedu.jc.domain.Knowledge">
+        <id     column="id"              property="id"/>
+        <result column="book_id"         property="bookId"/>
+        <result column="parent_id"       property="parentId"/>
+        <result column="name"            property="name"/>
+        <result column="konwledge_code"  property="konwledgeCode"/>
+        <result column="desc"            property="desc"/>
+        <result column="level"           property="level"/>
+        <result column="type"            property="type"/>
+        <result column="order_num"       property="orderNum"/>
+        <result column="extra_json"      property="extraJson"/>
+        <result column="create_time"     property="createTime"/>
+        <result column="update_time"     property="updateTime"/>
+        <result column="creator"         property="creator"/>
+        <result column="updater"         property="updater"/>
+        <result column="tenant_id"       property="tenantId"/>
+    </resultMap>
+
+    <sql id="Base_Column_List">
+        id,
+        book_id,
+        parent_id,
+        name,
+        konwledge_code,
+        `desc`,
+        `level`,
+        `type`,
+        order_num,
+        extra_json,
+        create_time,
+        update_time,
+        creator,
+        updater,
+        tenant_id
+    </sql>
+
+</mapper>
diff --git a/app/api/playedu-course/src/main/resources/mapper/jc/NoteMapper.xml b/app/api/playedu-course/src/main/resources/mapper/jc/NoteMapper.xml
new file mode 100644
index 0000000..8902f42
--- /dev/null
+++ b/app/api/playedu-course/src/main/resources/mapper/jc/NoteMapper.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="xyz.playedu.jc.mapper.NoteMapper">
+
+    <resultMap id="NoteResultMap" type="xyz.playedu.jc.domain.Note">
+        <id     column="id"                 property="id"/>
+        <result column="book_id"            property="bookId"/>
+        <result column="user_id"            property="userId"/>
+        <result column="chapter_id"         property="chapterId"/>
+        <result column="content"            property="content"/>
+        <result column="txt"                property="txt"/>
+        <result column="section_id"         property="sectionId"/>
+        <result column="section_origin_id"  property="sectionOriginId"/>
+        <result column="extra_json"         property="extraJson"/>
+        <result column="create_time"        property="createTime"/>
+        <result column="update_time"        property="updateTime"/>
+        <result column="creator"            property="creator"/>
+        <result column="updater"            property="updater"/>
+        <result column="tenant_id"          property="tenantId"/>
+    </resultMap>
+
+    <sql id="Base_Column_List">
+        id,
+        book_id,
+        user_id,
+        chapter_id,
+        content,
+        txt,
+        section_id,
+        section_origin_id,
+        extra_json,
+        create_time,
+        update_time,
+        creator,
+        updater,
+        tenant_id
+    </sql>
+
+</mapper>