fix: simplify docker-compose for Coolify v4 compatibility

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   backend:
     build: ./backend
@@ -10,14 +8,6 @@ services:
     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:
@@ -29,9 +19,3 @@ services:
     depends_on:
       - backend
     restart: unless-stopped
-    networks:
-      - app-network
-
-networks:
-  app-network:
-    driver: bridge