chore: add remaining test docs, scripts and temp files

- Add Git commit preparation checklist
- Add Phase testing guides and issue tracking
- Add utility scripts (env setup, test data initialization)
- Add temp migration SQL files (for reference)
- Update startup scripts and README
- Remove obsolete scripts

frontend/src/types/index.ts

@@ -78,6 +78,12 @@ export interface Document {
   tokensCount?: number
   uploadedAt: string
   processedAt?: string
+  // Phase 2: 全文阅读模式新增字段
+  extractionMethod?: string  // pymupdf/nougat/mammoth/direct
+  extractionQuality?: number // 0-1质量分数
+  charCount?: number         // 字符数
+  language?: string          // 检测到的语言
+  extractedText?: string     // 提取的文本内容
 }
 
 // API响应类型