feat: move vercel entrance to api

api/vercel.ts

@@ -0,0 +1,11 @@
+import { handle } from 'hono/vercel';
+import app from '@/app';
+import logger from '@/utils/logger';
+
+export const runtime = 'edge';
+
+logger.info(`🎉 RSSHub is running! Cheers!`);
+logger.info('💖 Can you help keep this open source project alive? Please sponsor 👉 https://docs.rsshub.app/support');
+
+export const GET = handle(app);
+export const POST = handle(app);