fix(deploy): remove backend/app volume mount to use container files

docker-compose.yml

@@ -8,8 +8,7 @@ services:
     environment:
       - DATABASE_URL=postgresql+asyncpg://reviflow:reviflow@db:5432/reviflow
       - OPENROUTER_API_KEY=${OPENROUTER_API_KEY}
-    volumes:
+    volumes: # - ./backend/app:/app/backend/app
-      - ./backend/app:/app/backend/app
     depends_on:
       db:
         condition: service_healthy