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

backend/初始化测试用户.bat

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+@echo off
+chcp 65001 > nul
+echo.
+echo ========================================
+echo   初始化测试用户
+echo ========================================
+echo.
+
+cd /d "%~dp0"
+
+echo [1/1] 正在初始化测试用户数据...
+call npm run prisma:seed
+
+echo.
+echo ========================================
+echo   初始化完成！
+echo ========================================
+echo.
+echo 测试账号信息：
+echo   邮箱: test@example.com
+echo   密码: password123
+echo   用户ID: user-mock-001
+echo.
+echo 管理员账号信息：
+echo   邮箱: admin@example.com
+echo   密码: password123
+echo   用户ID: user-admin-001
+echo.
+echo 现在可以创建知识库了！
+echo.
+
+pause
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