feat: refactor camera to react-webcam, add test route, and fix docker volume for ffmpeg

docker-compose.yml

@@ -60,6 +60,8 @@ services:
     restart: unless-stopped
     environment:
       API_KEY: ${FFMPEG_API_KEY:-socialflow-secret-ffmpeg-key}
+    volumes:
+      - ./ffmpeg-service:/app
     networks:
       - internal
     expose: