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。

logistics_chat/runtime.py

@@ -0,0 +1,33 @@
+"""Explicit local serving entry point; importing it starts no server."""
+
+
+def local_ips():
+    import socket
+    ips = set()
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as connection:
+            connection.connect(('8.8.8.8', 80))
+            ips.add(connection.getsockname()[0])
+    except Exception:
+        pass
+    try:
+        for info in socket.getaddrinfo(socket.gethostname(), None, socket.AF_INET):
+            ip = info[4][0]
+            if not ip.startswith('127.'):
+                ips.add(ip)
+    except Exception:
+        pass
+    return sorted(ips)
+
+
+def serve_app(app):
+    host, port = app.config['HOST'], app.config['PORT']
+    print(f'Local: http://127.0.0.1:{port}')
+    for ip in local_ips():
+        print(f'LAN: http://{ip}:{port}')
+    try:
+        from waitress import serve
+    except ImportError:
+        app.run(host=host, port=port, debug=True, use_reloader=False)
+    else:
+        serve(app, host=host, port=port, threads=8)