Add new user paths, update user routing to new (WORKING!) user auth version of BE

app/api/users/user/username/[username]/route.ts

@@ -0,0 +1,19 @@
+const BACKEND_URL = process.env.BACKEND_URL;
+
+export async function GET(
+  _request: Request,
+  { params }: { params: Promise<{ username: string }> },
+) {
+  const { username } = await params;
+  const response = await fetch(`${BACKEND_URL}/users/user/name/${username}`);
+
+  if (!response.ok) {
+    return new Response("Request failed in backend", {
+      status: response.status,
+    });
+  }
+
+  const data = await response.json();
+
+  return Response.json(data);
+}