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/stream_worker.py

@@ -41,10 +41,14 @@ class CameraStreamWorker:
         surgery_id: str,
         camera_id: str,
         url: str,
+        open_timeout_sec: float | None = None,
     ) -> None:
         self._surgery_id = surgery_id
         self._camera_id = camera_id
         self._url = url
+        self._open_timeout_sec = (
+            float(open_timeout_sec) if open_timeout_sec is not None else bp.VIDEO_OPEN_TIMEOUT_SEC
+        )
 
     async def run(
         self,
@@ -63,7 +67,7 @@ class CameraStreamWorker:
                 if cap is None:
                     try:
                         cap = RtspCapture(
-                            self._url, open_timeout_sec=bp.VIDEO_OPEN_TIMEOUT_SEC
+                            self._url, open_timeout_sec=self._open_timeout_sec
                         )
                         await asyncio.to_thread(cap.open)
                         consecutive_failures = 0