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/__tests__/api/review.spec.ts

@@ -14,12 +14,9 @@ import {
   getFragmentDetail,
   getReportDetail,
   getReviewFeed,
-  getReviewMindMap,
   getReviewTaskStats,
   getReviewTaskStatsByTask,
   getTaskReview,
-  upsertReviewMindMap,
-  uploadReviewMindMap,
 } from '@/api/review'
 
 const mockedRequest = vi.mocked(request)
@@ -79,31 +76,4 @@ describe('review API', () => {
     expect(mockedRequest.get).toHaveBeenCalledWith('/review/task/T001')
   })
 
-  it('review mind map API calls expected endpoints', async () => {
-    mockedRequest.get.mockResolvedValue({ code: 200, data: null })
-    mockedRequest.put.mockResolvedValue({ code: 200, data: { id: 1 } })
-    mockedRequest.post.mockResolvedValue({ code: 200, data: { id: 2 } })
-
-    await getReviewMindMap('T001')
-    expect(mockedRequest.get).toHaveBeenCalledWith('/review/mind-map/T001')
-
-    await upsertReviewMindMap('T001', {
-      title: 'Map',
-      content: 'content',
-      contentFormat: 'TEXT',
-    })
-    expect(mockedRequest.put).toHaveBeenCalledWith('/review/mind-map/T001', {
-      title: 'Map',
-      content: 'content',
-      contentFormat: 'TEXT',
-    })
-
-    const file = new File(['# Java'], 'java.md', { type: 'text/markdown' })
-    await uploadReviewMindMap('T001', file)
-    expect(mockedRequest.post).toHaveBeenCalledWith(
-      '/review/mind-map/T001/upload',
-      expect.any(FormData),
-      { headers: { 'Content-Type': 'multipart/form-data' } },
-    )
-  })
 })