重构物流客服模块并完善会话接待工作台

- 拆分应用工厂、业务服务与路由，保留原有 HTTP/SSE 和存储入口
- 分离页面资源，重排客服工作台并完善响应式导航、草稿和附件交互
- 整理维护脚本、请求示例和贡献指南，移除启动脚本中的密钥配置
- 上传文件改为仅本地保留，补充隔离的后端与前端回归验证

验证：46 项 Python 测试通过，含 14 个已有子测试；12 个 Node 前端场景通过。

start.bat

@@ -1,21 +1,46 @@
 @echo off
-chcp 936 >nul
-title Baiyue Logistics AI Customer Service
+setlocal DisableDelayedExpansion
 cd /d "%~dp0"
 
+set "PYTHON_ARGS="
+if defined VIRTUAL_ENV (
+    set "PYTHON_EXE=%VIRTUAL_ENV%\Scripts\python.exe"
+    call :probe_python
+    if not errorlevel 1 goto python_ready
+)
+
+set "PYTHON_EXE=%~dp0.venv\Scripts\python.exe"
+call :probe_python
+if not errorlevel 1 goto python_ready
+
+set "PYTHON_EXE=py.exe"
+set "PYTHON_ARGS=-3"
+call :probe_python
+if not errorlevel 1 goto python_ready
+
+set "PYTHON_EXE=python.exe"
+set "PYTHON_ARGS="
+call :probe_python
+if not errorlevel 1 goto python_ready
+
+echo [ERROR] No working Python 3 interpreter found. Install Python or recreate .venv.
+if /i "%~1"=="--check-python" exit /b 1
+pause
+exit /b 1
+
+:python_ready
+if /i "%~1"=="--check-python" (
+    "%PYTHON_EXE%" %PYTHON_ARGS% -c "import sys; print(sys.executable)"
+    exit /b
+)
+
+chcp 936 >nul
+title Baiyue Logistics AI Customer Service
 echo ============================================
 echo   Baiyue Logistics AI Customer Service
 echo ============================================
 echo.
 
-where python >nul 2>nul
-if errorlevel 1 (
-    echo [ERROR] python not found. Install Python and tick "Add to PATH".
-    echo.
-    pause
-    exit /b 1
-)
-
 echo [1/3] Checking port 5000 ...
 netstat -ano | findstr "LISTENING" | findstr /C:":5000 " >nul
 if not errorlevel 1 (
@@ -35,9 +60,10 @@ if not errorlevel 1 (
 echo       OK - port is free.
 
 echo [2/3] Checking DEEPSEEK_API_KEY ...
-if "%DEEPSEEK_API_KEY%"=="" (
+if not defined DEEPSEEK_API_KEY (
     echo.
     echo [WARN] DEEPSEEK_API_KEY is empty in this window.
+    echo .env files are not loaded automatically.
     echo If you just ran setx, reopen this window or restart VS Code.
     echo     setx DEEPSEEK_API_KEY "sk-xxxxxxxx"
     echo.
@@ -47,10 +73,10 @@ if "%DEEPSEEK_API_KEY%"=="" (
 )
 
 echo [3/3] Checking dependencies ...
-python -c "import flask, requests" >nul 2>nul
+"%PYTHON_EXE%" %PYTHON_ARGS% -c "import flask, requests, waitress" >nul 2>nul
 if errorlevel 1 (
     echo       Missing packages, installing ...
-    python -m pip install -r requirements.txt
+    "%PYTHON_EXE%" %PYTHON_ARGS% -m pip install -r requirements.txt
     if errorlevel 1 (
         echo [ERROR] pip install failed, check network and retry.
         pause
@@ -67,8 +93,15 @@ echo ============================================
 echo.
 
 start "" http://127.0.0.1:5000
-python am.py
+"%PYTHON_EXE%" %PYTHON_ARGS% am.py
+set "APP_EXIT_CODE=%ERRORLEVEL%"
 
 echo.
 echo Server stopped.
-pause
+pause
+exit /b %APP_EXIT_CODE%
+
+:probe_python
+"%PYTHON_EXE%" %PYTHON_ARGS% -c "import sys; sys.exit(0 if sys.version_info.major == 3 else 1)" >nul 2>nul
+if "%ERRORLEVEL%"=="0" exit /b 0
+exit /b 1