chore: 服务骨架（Hono+TS+vitest+eslint，health 路由与探活注册点）

src/app/app.ts

@@ -0,0 +1,8 @@
+import { Hono } from 'hono';
+import { healthRoute } from './health';
+
+export function buildApp(): Hono {
+  const app = new Hono();
+  app.route('/health', healthRoute());
+  return app;
+}