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.

backend/src/products/products.service.ts

@@ -407,4 +407,27 @@ export class ProductsService {
     await this.prisma.product.updateMany({ where: { id: { in: ids } }, data: updateData });
     return { updated: ids.length };
   }
+
+  async findUncategorized(): Promise<{ id: number; name: string; canonicalName: string | null }[]> {
+    return this.prisma.product.findMany({
+      where: { isActive: true, categoryId: null, status: 'active' },
+      select: { id: true, name: true, canonicalName: true },
+      orderBy: { name: 'asc' },
+    });
+  }
+
+  async findPending() {
+    return this.prisma.product.findMany({
+      where: { status: 'pending' },
+      include: {
+        categoryRef: { include: { parent: true } },
+        owner: { select: { id: true, username: true } },
+      },
+      orderBy: { createdAt: 'desc' },
+    });
+  }
+
+  setStatus(id: number, status: string) {
+    return this.prisma.product.update({ where: { id }, data: { status } });
+  }
 }