feat: add Vercel deployment support to app-host example using Hono

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/cc91e2f2-a734-4a52-b865-5fa83a86e934

Co-authored-by: xuyushun441-sys <255036401+xuyushun441-sys@users.noreply.github.com>

Author: Claude

examples/app-host/.npmrc

@@ -0,0 +1,3 @@
+# Vercel deployment configuration
+# Use hoisted node_modules to prevent symlink issues
+node-linker=hoisted

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

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+// Vercel Serverless Function — Catch-all API route.
+//
+// This file MUST be committed to the repository so Vercel can detect it
+// as a serverless function during the pre-build phase.
+//
+// It delegates to the esbuild bundle (`_handler.js`) generated by
+// `scripts/bundle-api.mjs` during the Vercel build step.  A separate
+// bundle file is used (rather than overwriting this file) so that:
+//   1. Vercel always finds this committed entry point (no "File not found").
+//   2. Vercel does not TypeScript-compile a .ts stub that references
+//      source files absent at runtime (no ERR_MODULE_NOT_FOUND).
+//
+// @see ../server/index.ts    — the actual server entrypoint
+// @see ../scripts/bundle-api.mjs — the esbuild bundler
+
+export { default, config } from './_handler.js';