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/categories/categories.service.ts

@@ -8,6 +8,12 @@ export type CategoryNode = {
   children: CategoryNode[];
 };
 
+export type FlatCategory = {
+  id: number;
+  name: string;
+  path: string;
+};
+
 @Injectable()
 export class CategoriesService {
   constructor(private readonly prisma: PrismaService) {}
@@ -30,4 +36,15 @@ export class CategoriesService {
     });
     return roots;
   }
+
+  async findFlattened(): Promise<FlatCategory[]> {
+    const all = await this.prisma.category.findMany({ orderBy: { name: 'asc' } });
+    const nameMap = new Map<number, string>();
+    all.forEach((c) => nameMap.set(c.id, c.name));
+    return all.map((c) => ({
+      id: c.id,
+      name: c.name,
+      path: c.parentId ? `${nameMap.get(c.parentId) ?? ''} > ${c.name}` : c.name,
+    }));
+  }
 }