fix: expose ports, add healthcheck and shared network for Coolify

docker-compose.yml

@@ -3,13 +3,35 @@ version: '3.8'
 services:
   backend:
     build: ./backend
+    expose:
+      - 3001
     env_file:
       - .env
+    environment:
+      - PORT=3001
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "wget --spider -q http://localhost:3001 || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+    networks:
+      - app-network
 
   frontend:
     build:
       context: ./frontend
       args:
         - VITE_API_URL=/api
+    expose:
+      - 80
     depends_on:
       - backend
+    restart: unless-stopped
+    networks:
+      - app-network
+
+networks:
+  app-network:
+    driver: bridge