MAJOR UPPDATE: "First Ai"

feat: add AI categorization for products and enhance user management

- Integrated AI service for category suggestions in receipt import and product management.
- Added premium subscription feature for users with corresponding API endpoints.
- Implemented admin interface for managing pending product suggestions.
- Enhanced user management to include premium status and corresponding UI updates.
- Updated database schema to support new fields for premium status and product status.

frontend/app/api/admin-users/[id]/route.ts

@@ -19,6 +19,22 @@ export async function PATCH(
   if (!session) return NextResponse.json({ message: 'Förbjuden' }, { status: 403 });
 
   const body = await request.json();
+
+  // Om body innehåller isPremium → anropa /premium-endpoint
+  if ('isPremium' in body) {
+    const res = await fetch(`${API_BASE}/api/users/${id}/premium`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bearer ${session.accessToken}`,
+      },
+      body: JSON.stringify({ isPremium: body.isPremium }),
+    });
+    const data = await res.json();
+    return NextResponse.json(data, { status: res.status });
+  }
+
+  // Annars → roll-byte
   const res = await fetch(`${API_BASE}/api/users/${id}/role`, {
     method: 'PATCH',
     headers: {