tRPC Endpoint를 /api/trpc로 변경

src/routes/api/trpc/[trpc]/+server.ts

@@ -0,0 +1,15 @@
+import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
+import { createContext } from "$trpc/init.server";
+import { appRouter } from "$trpc/router.server";
+import type { RequestHandler } from "./$types";
+
+const trpcHandler: RequestHandler = (event) =>
+  fetchRequestHandler({
+    endpoint: "/api/trpc",
+    req: event.request,
+    router: appRouter,
+    createContext: () => createContext(event),
+  });
+
+export const GET = trpcHandler;
+export const POST = trpcHandler;