fix: include server in root build script

Railway start command needs packages/server/dist/index.js which was not being built.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: argenisleon

package.json

@@ -35,7 +35,9 @@
     "start:client": "bun run --cwd packages/client build && bun run --cwd packages/client preview",
     "dev:client": "bun run --cwd packages/client dev",
     "dev:agent": "bun run --cwd packages/agent dev",
-    "build": "bun run --cwd packages/client build && bun run --cwd packages/runtime build",
+    "build": "bun run --cwd packages/client build && bun run --cwd packages/runtime build && bun run --cwd packages/server build",
+    "build:railway": "bun install && bun run build",
+    "start:railway": "cd packages/server && bun run start",
     "prepublishOnly": "npm run build",
     "db:push": "bun run --cwd packages/runtime db:push",
     "db:studio": "bun run --cwd packages/runtime db:studio",