fix: update application and Docker configuration to use port 80 for consistency

docker-compose-coolify.yml

@@ -11,7 +11,7 @@ services:
     volumes:
       - app-uploads:/app/api/content
     ports:
-      - "3000"
+      - "80"
     environment:
       - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
       - NEXTAUTH_URL=${NEXTAUTH_URL}
@@ -45,10 +45,12 @@ services:
         - CMD
         - curl
         - '-f'
-        - 'http://127.0.0.1:3000'
+        - 'http://127.0.0.1:80'
       interval: 2s
       timeout: 10s
       retries: 10
+    labels:
+      - "traefik.http.services.${DEPLOYMENT_NAME:-learnhouse}.loadbalancer.server.port=80"
 
   db:
     image: postgres:16-alpine