重构代理池系统：简化架构并增强核心功能

后端变更：
- 移除 tasks_manager.py 和 core/auth.py，简化架构
- 新增 core/scheduler.py 验证调度器，替代原有任务管理
- 大幅优化 api_server.py：统一错误处理、增强参数验证、支持调度器控制
- validator.py 增强 SOCKS4/SOCKS5 代理验证支持
- config.py 清理废弃配置（WebSocket、API Key、认证开关）
- SQLite 数据库操作性能优化

前端变更：
- 移除任务管理页面 (CrawlerTasks) 和 WebSocket 相关代码
- 路由简化为 4 个核心页面：总览、代理列表、插件管理、设置
- 提取前端工具函数（clipboard、confirm、format）和 API 类型定义
- 优化 CSS 架构：完善 variables、utilities、element-plus 样式
- Dashboard、Plugins、ProxyList、Settings 页面 UI/UX 优化
- App.vue 响应式侧边栏和页面过渡动画优化

其他：
- 移除 PowerShell 启动脚本，简化 Windows 批处理脚本
- 新增 README_SOCKS.md SOCKS 代理支持文档
- .env.example 和 .gitignore 更新

script/start.bat

@@ -1,9 +1,95 @@
 @echo off
 chcp 65001 >nul
-setlocal
-cd /d %~dp0
+echo === ProxyPool Startup ===
+echo.
 
-REM Launch via PowerShell to avoid encoding issues with Chinese characters
-powershell -ExecutionPolicy Bypass -File start.ps1
+set "ROOT_PATH=%~dp0.."
+set "BACKEND_PORT=9949"
+set "FRONTEND_PORT=9948"
 
-timeout /t 3
+REM 1. Clean processes on ports
+echo [1/4] Cleaning old processes...
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":%BACKEND_PORT%" ^| findstr "LISTENING"') do (
+    taskkill /F /PID %%a >nul 2>&1
+    echo   Stopped port %BACKEND_PORT% (PID: %%a)
+)
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":%FRONTEND_PORT%" ^| findstr "LISTENING"') do (
+    taskkill /F /PID %%a >nul 2>&1
+    echo   Stopped port %FRONTEND_PORT% (PID: %%a)
+)
+echo   Cleanup complete!
+echo.
+
+REM 2. Start Backend
+echo [2/4] Starting backend (FastAPI)...
+if exist "%ROOT_PATH%\venv\Scripts\python.exe" (
+    set "PYTHON_PATH=%ROOT_PATH%\venv\Scripts\python.exe"
+    echo   Using venv
+) else (
+    set "PYTHON_PATH=python"
+    echo   Using system Python
+)
+
+cd /d "%ROOT_PATH%"
+set "PYTHONIOENCODING=utf-8"
+
+REM Clear old logs
+if exist "%ROOT_PATH%\logs\backend_startup.log" del /f "%ROOT_PATH%\logs\backend_startup.log" >nul 2>&1
+if exist "%ROOT_PATH%\logs\backend_error.log" del /f "%ROOT_PATH%\logs\backend_error.log" >nul 2>&1
+
+REM Start backend
+start /B "" "%PYTHON_PATH%" -u api_server.py >"%ROOT_PATH%\logs\backend_startup.log" 2>"%ROOT_PATH%\logs\backend_error.log"
+echo   Backend started
+echo.
+
+REM 3. Wait for backend
+echo [3/4] Waiting for backend...
+set RETRY_COUNT=0
+set BACKEND_READY=0
+
+:WAIT_LOOP
+if %RETRY_COUNT% geq 10 goto WAIT_DONE
+timeout /t 2 /nobreak >nul
+set /a RETRY_COUNT+=1
+
+ping -n 1 127.0.0.1 -w 500 >nul
+timeout /t 1 /nobreak >nul
+
+REM Try to connect to backend
+powershell -Command "try { $r = Invoke-RestMethod -Uri 'http://127.0.0.1:9949/' -TimeoutSec 2 -ErrorAction Stop; exit 0 } catch { exit 1 }" >nul 2>&1
+if %errorlevel% equ 0 (
+    set BACKEND_READY=1
+    goto WAIT_DONE
+)
+echo   Waiting... (%RETRY_COUNT%/10)
+
+if exist "%ROOT_PATH%\logs\backend_startup.log" (
+    for /f "delims=" %%i in ('powershell -Command "Get-Content '%ROOT_PATH%\logs\backend_startup.log' -Tail 1" 2^>nul') do (
+        echo     Log: %%i
+    )
+)
+goto WAIT_LOOP
+
+:WAIT_DONE
+if %BACKEND_READY% equ 0 (
+    echo.
+    echo Backend failed to start!
+    echo Check error log: %ROOT_PATH%\logs\backend_error.log
+    pause
+    exit /b 1
+)
+echo   Backend is ready!
+echo.
+
+REM 4. Start Frontend
+echo [4/4] Starting frontend (Vite)...
+start /B "" cmd /c "cd /d "%ROOT_PATH%\frontend" && npm run dev" >nul 2>&1
+echo   Frontend started
+echo.
+
+echo === All services started ===
+echo Backend: http://127.0.0.1:9949
+echo Frontend: http://localhost:9948
+echo.
+echo Please open frontend in browser
+timeout /t 5 >nul