feat: enhance product model with subcategory, brand, tags, and nutrition; update related DTOs and services

backend/src/products/dto/set-tags.dto.ts

@@ -0,0 +1,8 @@
+import { IsArray, IsString, MaxLength } from 'class-validator';
+
+export class SetTagsDto {
+  @IsArray()
+  @IsString({ each: true })
+  @MaxLength(100, { each: true })
+  tags!: string[];
+}

backend/src/products/dto/update-product.dto.ts

@@ -16,4 +16,14 @@ export class UpdateProductDto {
   @IsString()
   @MaxLength(191)
   category?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(191)
+  subcategory?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(191)
+  brand?: string;
 }

backend/src/products/dto/upsert-nutrition.dto.ts

@@ -0,0 +1,38 @@
+import { IsNumber, IsOptional, Min } from 'class-validator';
+
+export class UpsertNutritionDto {
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  calories?: number;
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  protein?: number;
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  fat?: number;
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  carbohydrates?: number;
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  salt?: number;
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  sugar?: number;
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  fiber?: number;
+}