fix: 启动脚本绑定 venv Python + 缺依赖自动安装

- start.bat: 改用 .venv\Scripts\python.exe，缺依赖时自动 pip install
- start.sh: 优先 .venv/bin/python3，fallback 到系统 python3/python
- 两个脚本均不再依赖 uv，使用标准 python -m venv + pip

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

start.bat

@@ -11,8 +11,10 @@ echo.
 set PASS=0
 set FAIL=0
 
-:: ── Python ──
-python --version >nul 2>&1
+:: ── Python (venv) ──
+set PYTHON=%~dp0.venv\Scripts\python.exe
+if not exist "%PYTHON%" (echo   [FAIL] .venv 未创建，请先运行: python -m venv .venv ^&^& .venv\Scripts\pip install -r requirements.txt & pause & exit /b 1)
+"%PYTHON%" --version >nul 2>&1
 if %errorlevel% equ 0 (
     echo   [OK] Python
     set /a PASS+=1
@@ -22,22 +24,22 @@ if %errorlevel% equ 0 (
 )
 
 :: ── Python 依赖 ──
-python -c "import aiohttp" >nul 2>&1
+"%PYTHON%" -c "import aiohttp" >nul 2>&1
 if %errorlevel% equ 0 (echo   [OK] aiohttp& set /a PASS+=1) else (echo   [FAIL] aiohttp 缺失& set /a FAIL+=1)
 
-python -c "import yaml" >nul 2>&1
+"%PYTHON%" -c "import yaml" >nul 2>&1
 if %errorlevel% equ 0 (echo   [OK] PyYAML& set /a PASS+=1) else (echo   [FAIL] PyYAML 缺失& set /a FAIL+=1)
 
-python -c "import textual" >nul 2>&1
+"%PYTHON%" -c "import textual" >nul 2>&1
 if %errorlevel% equ 0 (echo   [OK] Textual& set /a PASS+=1) else (echo   [FAIL] Textual 缺失& set /a FAIL+=1)
 
-python -c "import watchdog" >nul 2>&1
+"%PYTHON%" -c "import watchdog" >nul 2>&1
 if %errorlevel% equ 0 (echo   [OK] watchdog& set /a PASS+=1) else (echo   [FAIL] watchdog 缺失& set /a FAIL+=1)
 
-python -c "import psutil" >nul 2>&1
+"%PYTHON%" -c "import psutil" >nul 2>&1
 if %errorlevel% equ 0 (echo   [OK] psutil& set /a PASS+=1) else (echo   [FAIL] psutil 缺失& set /a FAIL+=1)
 
-python -c "import rich" >nul 2>&1
+"%PYTHON%" -c "import rich" >nul 2>&1
 if %errorlevel% equ 0 (echo   [OK] rich& set /a PASS+=1) else (echo   [FAIL] rich 缺失& set /a FAIL+=1)
 
 :: ── 配置文件 ──
@@ -55,9 +57,14 @@ if exist "config\framework\base_config.yaml" (
 
 echo.
 if %FAIL% gtr 0 (
-    echo [FAIL] %FAIL% 项缺失，请先安装: pip install -r requirements.txt
-    pause
-    exit /b 1
+    echo [WARN] %FAIL% 项缺失，自动安装...
+    "%PYTHON%" -m pip install -r requirements.txt
+    if %errorlevel% neq 0 (
+        echo [FAIL] 安装失败，请手动执行: .venv\Scripts\pip install -r requirements.txt
+        pause
+        exit /b 1
+    )
+    echo [OK] 依赖安装完成
 )
 
 echo [OK] 所有依赖就绪 (%PASS% 项)
@@ -66,6 +73,6 @@ echo 🚀 启动 SenSu (无头模式)...
 echo    Web 面板: http://0.0.0.0:4200/SenSu
 echo.
 
-python main.py --headless
+"%PYTHON%" main.py --headless
 
 pause