feat(pkb): Complete PKB module frontend migration with V3 design

Summary:
- Implement PKB Dashboard and Workspace pages based on V3 prototype
- Add single-layer header with integrated Tab navigation
- Implement 3 work modes: Full Text, Deep Read, Batch Processing
- Integrate Ant Design X Chat component for AI conversations
- Create BatchModeComplete with template selection and document processing
- Add compact work mode selector with dropdown design

Backend:
- Migrate PKB controllers and services to /modules/pkb structure
- Register v2 API routes at /api/v2/pkb/knowledge
- Maintain dual API routes for backward compatibility

Technical details:
- Use Zustand for state management
- Handle SSE streaming responses for AI chat
- Support document selection for Deep Read mode
- Implement batch processing with progress tracking

Known issues:
- Batch processing API integration pending
- Knowledge assets page navigation needs optimization

Status: Frontend functional, pending refinement

重启所有服务.bat

@@ -1,36 +0,0 @@
-@echo off
-chcp 65001 >nul
-echo ========================================
-echo   停止所有服务并重新启动
-echo ========================================
-echo.
-
-echo [1/3] 停止所有Node进程...
-taskkill /F /IM node.exe >nul 2>&1
-timeout /t 2 /nobreak >nul
-
-echo [2/3] 启动后端服务（端口3001）...
-cd /d "%~dp0backend"
-start "【后端服务】端口3001" cmd /k "npm run dev"
-timeout /t 5 /nobreak >nul
-
-echo [3/3] 启动前端服务（端口3000）...
-cd /d "%~dp0frontend"
-start "【前端服务】端口3000" cmd /k "npm run dev"
-
-echo.
-echo ========================================
-echo   ✅ 服务重启完成！
-echo ========================================
-echo.
-echo 📍 前端地址: http://localhost:3000
-echo 📍 后端地址: http://localhost:3001
-echo.
-echo 提示：
-echo - 已打开2个新窗口，请不要关闭
-echo - 请等待15-20秒让服务完全启动
-echo - 然后访问 http://localhost:3000
-echo.
-pause
-
-