feat(admin): set /admin base path for reverse proxy deployment

Configure Vite base, Vue Router history, axios baseURL and container
Nginx to serve the admin panel under /admin/ path prefix.

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apps/api/.env

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+DATABASE_URL=postgresql://thebet365:thebet365@localhost:5432/thebet365
+REDIS_URL=redis://localhost:6379
+JWT_SECRET=dev-secret-change-in-production
+JWT_PLAYER_EXPIRES=24h
+JWT_ADMIN_EXPIRES=2h
+JWT_AGENT_EXPIRES=8h
+PORT=3000
+NODE_ENV=development