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/db/drizzle/meta/_journal.json

@@ -36,6 +36,13 @@
       "when": 1775986238669,
       "tag": "0004_red_annihilus",
       "breakpoints": true
+    },
+    {
+      "idx": 5,
+      "version": "7",
+      "when": 1776154563168,
+      "tag": "0005_broad_mariko_yashida",
+      "breakpoints": true
     }
   ]
-}
+}