fix(core): resolve local client url redirects and stabilize dev environment

- enforce localhost:5174 for wheel campaign client URL in local development
- lock vite dev server ports using strictPort on admin (5173) and client (5174)
- sanitize .env.example and remove hardcoded staging domain
- configure root dev orchestration and docker multi-stage build context

docker-compose.yml

@@ -38,7 +38,7 @@ services:
     container_name: lucky_wheel_api
     restart: unless-stopped
     ports:
-      - "3000:3000"
+      - "3001:3000"
     environment:
       - DATABASE_URL=postgresql://postgres:postgrespassword@postgres:5432/lucky_wheel?schema=public
       - REDIS_HOST=redis
@@ -54,9 +54,12 @@ services:
     build:
       context: .
       dockerfile: apps/admin/Dockerfile
+      args:
+        VITE_CLIENT_PUBLIC_URL: ${VITE_CLIENT_PUBLIC_URL:-}
     container_name: lucky_wheel_admin
     restart: unless-stopped
     ports:
+      - "5173:80"
       - "8080:80"
     depends_on:
       - api
@@ -68,6 +71,7 @@ services:
     container_name: lucky_wheel_client
     restart: unless-stopped
     ports:
+      - "5174:80"
       - "80:80"
     depends_on:
       - api