feat(auth): add /login page, session middleware, role-based navigation and logout

src/app/auth/actions.ts

@@ -0,0 +1,10 @@
+'use server';
+
+import { createClient } from '@/lib/supabase/server';
+import { redirect } from 'next/navigation';
+
+export async function logoutAction() {
+  const supabase = await createClient();
+  await supabase.auth.signOut();
+  redirect('/login');
+}