upgrade prod to postgres 18 same as dev

docker-compose.yml

@@ -10,7 +10,7 @@
 services:
 
   postgres:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     container_name: vibefinance_postgres
     restart: unless-stopped
     environment:
@@ -18,7 +18,7 @@ services:
       POSTGRES_USER:     ${POSTGRES_USER:-vibefinance}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
     volumes:
-      - vibefinance_pgdata:/var/lib/postgresql/data
+      - vibefinance_pgdata:/var/lib/postgresql
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U vibefinance"]
       interval: 10s
@@ -51,7 +51,7 @@ services:
     container_name: vibefinance_frontend
     restart: unless-stopped
     ports:
-      - "${FRONTEND_PORT:-3300}:80"
+      - "${FRONTEND_PORT:-3400}:80"
     depends_on:
       backend:
         condition: service_healthy