fix(app-host): add Hono import to api entrypoint and .npmrc for Vercel deployment

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/9621c65e-3c3d-4683-b92b-b41ad6639997

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

examples/app-host/.npmrc

@@ -0,0 +1,3 @@
+# Vercel pnpm configuration
+# Use hoisted node_modules structure instead of symlinks to avoid Vercel packaging errors.
+node-linker=hoisted

examples/app-host/api/[[...route]].js

@@ -13,4 +13,7 @@
 // @see ../server/index.ts    — the actual server entrypoint
 // @see ../scripts/bundle-api.mjs — the esbuild bundler
 
+// Import Hono to satisfy Vercel's framework detection (unused, but required for detection).
+import 'hono';
+
 export { default, config } from './_handler.js';