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/enums/TaskApplicationStatusEnum.java

@@ -0,0 +1,35 @@
+package com.guo.learningprogresstracker.enums;
+
+import lombok.AllArgsConstructor;
+
+import java.util.Arrays;
+import java.util.Locale;
+
+@AllArgsConstructor
+public enum TaskApplicationStatusEnum {
+    TODO("TODO", "待应用"),
+    DOING("DOING", "应用中"),
+    DONE("DONE", "已完成");
+
+    private final String code;
+    private final String description;
+
+    public String getCode() {
+        return code;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public static TaskApplicationStatusEnum fromCodeOrDefault(String code) {
+        if (code == null || code.trim().isEmpty()) {
+            return TODO;
+        }
+        String normalized = code.trim().toUpperCase(Locale.ROOT);
+        return Arrays.stream(values())
+                .filter(status -> status.code.equals(normalized))
+                .findFirst()
+                .orElse(TODO);
+    }
+}