feat(复习)：标准思维导图生成与回忆对比

- 新增 review_standard_mind_maps / review_recall_records 数据表
- BuiltinMindMapGenerator：从报告/残片/应用场景规则生成标准导图
- MindMapAiClient 接口 + RemoteAiMindMapClient 预留
- StandardMindMapService：生成/编辑/重新生成/回忆对比
- 对比算法：标题归一化 + Bigram Jaccard 模糊匹配
- ReviewController 新增 6 个端点
- MindMapTreeTool / MindMapNode / CompareResult 工具类
- 完整单元测试（10 个，全部通过）
- 更新 docs/review-module-design.md

src/main/java/com/guo/learningprogresstracker/entity/ReviewStandardMindMapEntity.java

@@ -0,0 +1,63 @@
+package com.guo.learningprogresstracker.entity;
+
+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.io.Serializable;
+import java.time.LocalDateTime;
+
+/**
+ * 任务标准思维导图：由内置规则或 AI 从学习报告/残片生成，用户可修改
+ */
+@TableName(value = "review_standard_mind_maps")
+@Data
+public class ReviewStandardMindMapEntity extends BaseEntity implements Serializable {
+
+    @TableId(value = "id", type = IdType.AUTO)
+    private Integer id;
+
+    @TableField(value = "task_num")
+    private String taskNum;
+
+    @TableField(value = "title")
+    private String title;
+
+    /**
+     * 标准导图统一树结构 JSON（根节点：{title, notes, children}）
+     */
+    @TableField(value = "content")
+    private String content;
+
+    /**
+     * 缩进大纲文本，供前端展示与用户编辑
+     */
+    @TableField(value = "outline")
+    private String outline;
+
+    @TableField(value = "summary")
+    private String summary;
+
+    /**
+     * 生成来源：BUILTIN/AI/USER
+     */
+    @TableField(value = "generator")
+    private String generator;
+
+    @TableField(value = "generator_version")
+    private String generatorVersion;
+
+    @TableField(value = "source_report_count")
+    private Integer sourceReportCount;
+
+    @TableField(value = "source_fragment_count")
+    private Integer sourceFragmentCount;
+
+    @TableField(value = "generated_time")
+    private LocalDateTime generatedTime;
+
+    @TableField(exist = false)
+    private static final long serialVersionUID = 1L;
+}