feat(web-next): add Next.js 15 app shell with tRPC endpoint

apps/web-next/src/app/providers.tsx

@@ -0,0 +1,7 @@
+"use client";
+
+import { ApiProvider } from "@repo/api-client";
+
+export function Providers({ children }: { children: React.ReactNode }) {
+  return <ApiProvider trpcUrl="/api/trpc">{children}</ApiProvider>;
+}