feat: add production deployment config

- Add docker-compose.prod.yml and Caddyfile for Caddy reverse proxy
- Add production stages to frontend Dockerfile (nginx for static files)
- Fix monorepo package exports for production builds (dist/src paths)
- Add CORS_ORIGIN env var for cross-origin config
- Add Better Auth baseURL, cookie domain, and trusted origins from env
- Use VITE_API_URL for API calls in auth-client and play route
- Add credentials: include for cross-origin fetch requests
- Remove unused users table from schema

packages/shared/package.json

@@ -7,7 +7,7 @@
     "build": "tsc"
   },
   "exports": {
-    ".": "./src/index.ts"
+    ".": "./dist/src/index.js"
   },
   "dependencies": {
     "zod": "^4.3.6"