Remove edge runtime directive from route handler

Cloudflare Workers via OpenNext tidak support Next.js edge runtime.
Hapus export const runtime = "edge" agar handler jalan di Workers runtime.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/route.ts

@@ -6,7 +6,6 @@ import {
 	isAllowedTarget,
 } from "@/lib/relay-utils";
 
-export const runtime = "edge";
 
 async function handler(req: Request): Promise<Response> {
 	if (req.method === "OPTIONS") {