feat: 多语言任务、WebUI 增强与 Agent MCP 集成

重构 lib 为扁平模块并支持 Windows schtasks；新增 JS/Bash/PowerShell 模板、WebUI 调度编辑，以及 Cursor Skill 与 MCP 工具供 Agent 管理定时任务。

Co-authored-by: Cursor <cursoragent@cursor.com>

start-webui.bat

@@ -0,0 +1,32 @@
+@echo off
+setlocal EnableExtensions
+
+cd /d "%~dp0"
+
+set "BACKEND=%~dp0webui\backend"
+set "VENV=%BACKEND%\.venv"
+set "HOST=%SPROUTCLAW_CRON_WEB_HOST%"
+set "PORT=%SPROUTCLAW_CRON_WEB_PORT%"
+
+if not defined HOST set "HOST=0.0.0.0"
+if not defined PORT set "PORT=8765"
+
+if not exist "%VENV%\Scripts\python.exe" (
+    echo [webui] creating venv...
+    python -m venv "%VENV%"
+    if errorlevel 1 (
+        echo [webui] venv failed. Install Python and add it to PATH.
+        exit /b 1
+    )
+    echo [webui] installing deps...
+    "%VENV%\Scripts\python.exe" -m pip install -r "%BACKEND%\requirements.txt"
+    if errorlevel 1 exit /b 1
+)
+
+set "URL=http://127.0.0.1:%PORT%/"
+echo [webui] starting: %URL%
+start "" "%URL%"
+
+"%VENV%\Scripts\uvicorn.exe" main:app --app-dir "%BACKEND%" --host %HOST% --port %PORT% --reload --reload-dir "%BACKEND%" --reload-dir "%~dp0lib"
+
+endlocal