feat: redirect user dynamically based on role instead of /protected after login

shop/components/login-form.tsx

@@ -32,9 +32,12 @@ export function LoginForm({
     setError(null);
 
     try {
-      await signIn(email, password);
-      // Update this route to redirect to an authenticated route. The user already has an active session.
-      router.push("/protected");
+      const res = await signIn(email, password);
+      if (res.role === "admin") {
+        router.push("/admin/einstellungen");
+      } else {
+        router.push("/my-customers");
+      }
     } catch (error: unknown) {
       setError(error instanceof Error ? error.message : "An error occurred");
     } finally {