Use pre-built image from Gitea registry

Switch from local build to code.letsbe.solutions/letsbe/hub:latest
Remove development volume mount (not needed with pre-built image)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -2,7 +2,7 @@ version: "3.8"
 
 services:
   api:
-    build: .
+    image: code.letsbe.solutions/letsbe/hub:latest
     container_name: letsbe-hub-api
     environment:
       - DATABASE_URL=postgresql+asyncpg://hub:hub@db:5432/hub
@@ -13,8 +13,6 @@ services:
     depends_on:
       db:
         condition: service_healthy
-    volumes:
-      - ./app:/app/app:ro
     restart: unless-stopped
 
   db: