Add SuperTokens authentication integration

- Install supertokens-auth-react, supertokens-node, supertokens-web-js
- Create frontend and backend SuperTokens configuration
- Add API route handler for auth endpoints
- Add SuperTokensProvider wrapper in root layout
- Create new auth component with SuperTokens UI
- Configure Google and GitHub OAuth providers
- Ready for SuperTokens core deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

app/auth/supertokens-page.tsx

@@ -0,0 +1,18 @@
+"use client";
+
+import dynamic from "next/dynamic";
+import { useRouter } from "next/navigation";
+
+// Dynamically import to avoid SSR issues
+const SuperTokensComponentNoSSR = dynamic(
+  () => import("@/app/components/SuperTokensAuthComponent"),
+  { ssr: false }
+);
+
+export default function AuthPage() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-background">
+      <SuperTokensComponentNoSSR />
+    </div>
+  );
+}