Refactor client service to use expose instead of ports for reverse proxy handling.

docker-compose.yml

@@ -22,8 +22,9 @@ services:
     build:
       context: ./client
       dockerfile: Dockerfile
-    ports:
-      - "80:80"
+    # No ports binding - Coolify's reverse proxy handles external traffic
+    expose:
+      - "80"
     depends_on:
       server:
         condition: service_healthy