Add frontend service to Docker setup and configure networking

Introduced a new `frontend` service in `docker-compose.yml`, complete with build, healthchecks, and networking. Added a multi-stage Dockerfile for the frontend, a `.dockerignore` file, and a startup script to wait for the backend. Updated Next.js configuration for Docker compatibility and added API type definitions.

docker-compose.yml

@@ -14,6 +14,8 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
+    networks:
+      - app-network
 
   backend:
     build:
@@ -32,20 +34,33 @@ services:
     depends_on:
       db:
         condition: service_healthy
+    networks:
+      - app-network
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile
+      args:
+        - NEXT_PUBLIC_API_URL=http://backend:8000
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=production
+      - NEXT_PUBLIC_API_URL=http://backend:8000
+    depends_on:
+      - backend
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "http://localhost:3000"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+    networks:
+      - app-network
 
-#  frontend:
-#    build:
-#      context: .
-#      dockerfile: frontend/Dockerfile
-#    volumes:
-#      - ./frontend:/app
-#      - /app/node_modules
-#    ports:
-#      - "3000:3000"
-#    environment:
-#      - NEXT_PUBLIC_API_URL=http://backend:8000
-#    depends_on:
-#      - backend
 
 volumes:
-  postgres_data:
+  postgres_data:
+
+networks:
+  app-network:
+    driver: bridge