feat(video): 可配置 RTSP 打开超时并提高默认时长

- Settings 增加 video_open_timeout_sec（VIDEO_OPEN_TIMEOUT_SEC），默认 45s
- SessionManager 全部就绪等待为该值 + 5s；StreamWorker 传入单路超时
- baked pipeline 回退默认值与配置对齐；.env.example 补充说明
- or_site_config.sample.json 扩展穿透摄像头与术间绑定示例
- 同步 uv.lock

app/services/video/session_manager.py

@@ -183,7 +183,7 @@ class CameraSessionManager:
         stop_event = asyncio.Event()
         readies = [asyncio.Event() for _ in camera_ids]
         tasks: list[asyncio.Task[None]] = []
-        open_timeout = bp.VIDEO_OPEN_TIMEOUT_SEC + 5.0
+        open_timeout = float(self._s.video_open_timeout_sec) + 5.0
 
         for cam_id, ready in zip(camera_ids, readies, strict=True):
             tasks.append(
@@ -438,6 +438,7 @@ class CameraSessionManager:
                     surgery_id=surgery_id,
                     camera_id=camera_id,
                     url=url,
+                    open_timeout_sec=self._s.video_open_timeout_sec,
                 )
                 try:
                     await w_tear.run(
@@ -518,6 +519,7 @@ class CameraSessionManager:
                     surgery_id=surgery_id,
                     camera_id=camera_id,
                     url=url,
+                    open_timeout_sec=self._s.video_open_timeout_sec,
                 )
                 await worker.run(
                     stream_ready=stream_ready,