Implement RTSP streaming functionality for cameras

- Added endpoints to start and stop RTSP streaming for cameras in the API.
- Enhanced CameraManager and CameraStreamer classes to manage RTSP streaming state and processes.
- Updated API documentation to include new RTSP streaming commands.
- Modified Docker configurations to include FFmpeg for RTSP streaming support.
- Adjusted MediaMTX settings for improved stream handling and timeout configurations.

api-tests.http

@@ -37,6 +37,15 @@ POST {{API}}/cameras/camera1/stop-stream
 ### View live MJPEG stream in browser (open URL)
 # {{API}}/cameras/camera1/stream
 
+### Start RTSP streaming for camera1 (publishes to MediaMTX)
+POST {{API}}/cameras/camera1/start-rtsp
+
+### Stop RTSP streaming for camera1
+POST {{API}}/cameras/camera1/stop-rtsp
+
+### RTSP stream URL (use with VLC/ffplay):
+# rtsp://{{host}}:{{rtsp_port}}/camera1
+
 ### getting a list of all videos
 GET {{MEDIA}}/videos/?page=10&limit=1
 
@@ -78,6 +87,20 @@ Range: bytes=0-1048575
 #   ffplay -rtsp_transport tcp rtsp://{{host}}:{{rtsp_port}}/vod
 #   vlc rtsp://{{host}}:{{rtsp_port}}/vod
 
+# MediaMTX HTTP API (for checking streams)
+@MEDIAMTX_API = http://{{host}}:8889
+### Check MediaMTX version/info
+GET {{MEDIAMTX_API}}/v2/config/get
+
+### List all available RTSP paths/streams
+GET {{MEDIAMTX_API}}/v2/paths/list
+
+### Get info about a specific path (e.g., camera1)
+GET {{MEDIAMTX_API}}/v2/paths/get/camera1
+
+# MediaMTX Web Interface (open in browser)
+# http://{{host}}:8889/static/
+
 # If you enable WebRTC in MediaMTX, you can open its embedded player page (for testing):
 # See MediaMTX docs; by default we exposed RTSP and WebRTC ports in compose.