feat: 站点 JSON、语音终端 WebSocket 指派与客户端联调

- 用 OR_SITE_CONFIG_JSON_FILE 统一术间配置（video_rtsp_urls + voice_or_room_bindings）
- VoiceTerminalHub：assignment、WS 推送与 HTTP 查询；开录/停录后 notify
- 一键联调 orchestrate-and-start 与 /client/surgeries/start 共用指派逻辑，修复 demo 路径不发 WS
- 语音桌面端：SIGINT 退出、shutdown 清理、仅 WS 指派、固定 pending 轮询间隔、界面仅保留录音时长
- 新增/调整契约与绑定测试，文档与示例配置同步

Made-with: Cursor

docker-compose.prod.yml

@@ -44,8 +44,7 @@ services:
       # Video backends (RTSP / optional Hikvision SDK) — see docs/video-backends.md
       VIDEO_DEFAULT_BACKEND: ${VIDEO_DEFAULT_BACKEND:-rtsp}
       VIDEO_RTSP_URL_TEMPLATE: ${VIDEO_RTSP_URL_TEMPLATE:-}
-      VIDEO_RTSP_URLS_JSON_FILE: ${VIDEO_RTSP_URLS_JSON_FILE:-}
-      VIDEO_RTSP_URLS_JSON: ${VIDEO_RTSP_URLS_JSON:-}
+      OR_SITE_CONFIG_JSON_FILE: ${OR_SITE_CONFIG_JSON_FILE:-}
       VIDEO_CAMERA_BACKEND_OVERRIDES_JSON: ${VIDEO_CAMERA_BACKEND_OVERRIDES_JSON:-}
       HIKVISION_SDK_ENABLED: ${HIKVISION_SDK_ENABLED:-false}
       HIKVISION_LIB_DIR: ${HIKVISION_LIB_DIR:-/opt/hikvision/lib}