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/admin/products/actions.ts

@@ -105,3 +105,69 @@ export async function bulkSetCategory(ids: number[], categoryId: number | null)
 
   revalidatePath('/admin/products');
 }
+
+export async function suggestProductCategory(productId: number) {
+  const res = await fetch(`${API_BASE}/api/products/${productId}/suggest-category`, {
+    method: 'GET',
+    headers: { ...(await getAuthHeaders()) },
+    cache: 'no-store',
+  });
+
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(`AI-kategorisering misslyckades: ${text}`);
+  }
+
+  return res.json() as Promise<{
+    categoryId: number;
+    categoryName: string;
+    path: string;
+    confidence: 'high' | 'medium' | 'low';
+    usedFallback: boolean;
+  }>;
+}
+
+export async function suggestBulkCategories(productIds?: number[]) {
+  const res = await fetch(`${API_BASE}/api/products/ai-categorize-bulk`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json', ...(await getAuthHeaders()) },
+    body: JSON.stringify({ productIds }),
+    cache: 'no-store',
+  });
+
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(`Bulk-AI-kategorisering misslyckades: ${text}`);
+  }
+
+  return res.json() as Promise<
+    {
+      productId: number;
+      productName: string;
+      suggestion: {
+        categoryId: number;
+        categoryName: string;
+        path: string;
+        confidence: 'high' | 'medium' | 'low';
+        usedFallback: boolean;
+      };
+    }[]
+  >;
+}
+
+export async function setProductStatus(id: number, status: 'active' | 'rejected') {
+  const res = await fetch(`${API_BASE}/api/products/${id}/status`, {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json', ...(await getAuthHeaders()) },
+    body: JSON.stringify({ status }),
+    cache: 'no-store',
+  });
+
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(`Kunde inte uppdatera status: ${text}`);
+  }
+
+  revalidatePath('/admin/products');
+  revalidatePath('/admin/products/pending');
+}