Add processor heartbeat management and improve health check functionality

- Introduced processor heartbeat configuration in environment variables and Docker setup.
- Implemented heartbeat publishing in the processor worker.
- Enhanced health check endpoint to include processor availability status.
- Updated frontend components to handle processor unavailability messages.
- Added legacy return functionality in the upload panel.

faceai/docker/processor.Dockerfile

@@ -7,9 +7,17 @@ RUN apt-get update \
 
 WORKDIR /app
 
+COPY faceai/package.json ./package.json
+COPY faceai/apps/frontend/package.json apps/frontend/package.json
+COPY faceai/apps/backend/package.json apps/backend/package.json
+COPY faceai/apps/processor/package.json apps/processor/package.json
+
+RUN npm install
+
 COPY faceai /app
 COPY bin/Face_Recognition_Unix/face_matcher /app/bin/face_matcher
 
 RUN chmod +x /app/bin/face_matcher
 
+ENV NODE_ENV=production
 ENV FACEAI_MATCHER_BINARY=/app/bin/face_matcher