feat(sync): add converters from Hiboutik DTOs to Prisma inputs

Includes helpers for Hiboutik dates ("0000-00-00" is ignored) and optional prices ("0.00" means no value).

src/models/converter/category.converter.ts

@@ -0,0 +1,22 @@
+import { Injectable } from '@nestjs/common';
+import { CategoryHiboutikDto } from '../hiboutikDTO/category.hiboutik.dto';
+import { Converter } from './converter';
+import { CategoryCreateInput } from '../../../prisma/generated/models/Category';
+
+@Injectable()
+export class CategoryConverter extends Converter<CategoryCreateInput, CategoryHiboutikDto> {
+  /** The parent is not set here: it is linked afterwards, once every category exists (see CategoryHiboutikService). */
+  fromHiboutik(hiboutikDto: CategoryHiboutikDto): CategoryCreateInput {
+    return {
+      hiboutikId: hiboutikDto.category_id,
+      name: hiboutikDto.category_name,
+      enabled: hiboutikDto.category_enabled == 1,
+      position: Number(hiboutikDto.category_position) || 0,
+      webEnabled: hiboutikDto.category_enabled_www == 1,
+    };
+  }
+
+  toHiboutik(): CategoryHiboutikDto {
+    throw new Error('Method not implemented.');
+  }
+}