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/test/java/com/guo/learningprogresstracker/service/impl/TasksServiceImplTest.java

@@ -0,0 +1,63 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import com.guo.learningprogresstracker.dto.request.CreateTaskApplicationRequest;
+import com.guo.learningprogresstracker.entity.TaskApplicationEntity;
+import com.guo.learningprogresstracker.entity.TaskEntity;
+import com.guo.learningprogresstracker.enums.TaskApplicationStatusEnum;
+import com.guo.learningprogresstracker.mapper.TaskApplicationMapper;
+import com.guo.learningprogresstracker.mapper.TasksMapper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class TasksServiceImplTest {
+
+    @BeforeAll
+    static void initTableInfo() {
+        MybatisConfiguration configuration = new MybatisConfiguration();
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(configuration, ""), TaskEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(configuration, ""), TaskApplicationEntity.class);
+    }
+
+    @InjectMocks
+    private TasksServiceImpl tasksService;
+
+    @Mock
+    private TasksMapper tasksMapper;
+
+    @Mock
+    private TaskApplicationMapper taskApplicationMapper;
+
+    @Test
+    void createApplication_shouldUseDefaultStatusWhenStatusInvalid() throws Exception {
+        when(tasksMapper.exists(any())).thenReturn(true);
+        when(taskApplicationMapper.insert(any())).thenAnswer(invocation -> {
+            TaskApplicationEntity entity = invocation.getArgument(0);
+            entity.setId(7);
+            return 1;
+        });
+
+        CreateTaskApplicationRequest request = new CreateTaskApplicationRequest();
+        request.setTaskNum("T1");
+        request.setTitle("Build a demo");
+        request.setStatus("invalid");
+
+        TaskApplicationEntity entity = tasksService.createApplication(request);
+
+        assertEquals(7, entity.getId());
+        assertEquals(TaskApplicationStatusEnum.TODO.getCode(), entity.getStatus());
+        verify(taskApplicationMapper).insert(any(TaskApplicationEntity.class));
+    }
+}