chore: 移除上传导图 + 优化复习引导提示

- 删除 ReviewMindMap 接口及 upload/get/upsert API
- 删除 ReviewDetail 上传 UI 和思维导图预览
- 回忆复习按钮移至内容元信息区
- 引导提示改为渐进式：折叠时引导展开，展开后引导点击节点
- 提示语用告知语气，无表情符号

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/api/review.ts

@@ -23,25 +23,6 @@ export interface ReviewTaskStats {
   avgEffectivenessRatio: number;
 }
 
-export interface ReviewMindMap {
-  id: number;
-  taskNum: string;
-  title: string;
-  content: string;
-  contentFormat: "TEXT" | "MERMAID" | "JSON";
-  sourceType?: "MANUAL" | "FILE";
-  fileName?: string;
-  filePath?: string;
-  fileFormat?: "XMIND" | "MARKDOWN" | "OPML" | "FREEMIND" | "TEXT";
-  parsedContent?: string;
-  parseStatus?: "SUCCESS" | "FAILED";
-  parseError?: string;
-  summary?: string;
-  lastParsedTime?: string;
-  createdTime?: string;
-  lastModifiedTime?: string;
-}
-
 export const getReviewFeed = (limit: number = 30, mode: "recent" | "random" | "smart" = "recent") => {
   return request.get("/review/feed", { limit, mode });
 };
@@ -65,26 +46,3 @@ export const getFragmentDetail = (id: number) => {
 export const getTaskReview = (taskNum: string) => {
   return request.get(`/review/task/${taskNum}`);
 };
-
-export const getReviewMindMap = (taskNum: string) => {
-  return request.get(`/review/mind-map/${taskNum}`);
-};
-
-export const upsertReviewMindMap = (
-  taskNum: string,
-  payload: {
-    title: string;
-    content: string;
-    contentFormat?: ReviewMindMap["contentFormat"];
-  },
-) => {
-  return request.put(`/review/mind-map/${taskNum}`, payload);
-};
-
-export const uploadReviewMindMap = (taskNum: string, file: File) => {
-  const formData = new FormData();
-  formData.append("file", file);
-  return request.post(`/review/mind-map/${taskNum}/upload`, formData, {
-    headers: { "Content-Type": "multipart/form-data" },
-  });
-};