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/users/users.controller.ts

@@ -1,5 +1,5 @@
 import { Controller, Get, Patch, Post, Delete, Body, Param, ParseIntPipe, BadRequestException } from '@nestjs/common';
-import { IsEmail, IsIn, IsOptional, IsString, MaxLength, MinLength } from 'class-validator';
+import { IsBoolean, IsEmail, IsIn, IsOptional, IsString, MaxLength, MinLength } from 'class-validator';
 import { UsersService } from './users.service';
 import { CurrentUser } from '../auth/decorators/current-user.decorator';
 import { Roles } from '../auth/decorators/roles.decorator';
@@ -9,6 +9,11 @@ class SetRoleDto {
   role: string;
 }
 
+class SetPremiumDto {
+  @IsBoolean()
+  isPremium: boolean;
+}
+
 class AdminCreateUserDto {
   @IsString()
   @MinLength(2)
@@ -98,6 +103,16 @@ export class UsersController {
     return { id: updated.id, username: updated.username, role: updated.role };
   }
 
+  @Roles('admin')
+  @Patch(':id/premium')
+  async setPremium(
+    @Param('id', ParseIntPipe) id: number,
+    @Body() dto: SetPremiumDto,
+  ) {
+    const updated = await this.usersService.setPremium(id, dto.isPremium);
+    return { id: updated.id, username: updated.username, isPremium: updated.isPremium };
+  }
+
   @Roles('admin')
   @Post()
   async adminCreateUser(

backend/src/users/users.service.ts

@@ -25,7 +25,7 @@ export class UsersService {
 
   findAll() {
     return this.prisma.user.findMany({
-      select: { id: true, username: true, email: true, firstName: true, lastName: true, role: true, createdAt: true },
+      select: { id: true, username: true, email: true, firstName: true, lastName: true, role: true, isPremium: true, createdAt: true },
       orderBy: { username: 'asc' },
     });
   }
@@ -34,6 +34,10 @@ export class UsersService {
     return this.prisma.user.update({ where: { id }, data: { role } });
   }
 
+  setPremium(id: number, isPremium: boolean) {
+    return this.prisma.user.update({ where: { id }, data: { isPremium } });
+  }
+
   async adminCreate(data: { username: string; email: string; password: string; role?: string }) {
     const existing = await this.prisma.user.findFirst({
       where: { OR: [{ username: data.username }, { email: data.email }] },