feat(hiboutik): add Hiboutik API client, repositories and DTOs

HiboutikClient handles Basic auth and walks paginated endpoints. One read-only repository per entity (brands, categories, suppliers, products, stocks, customers).

src/models/hiboutikDTO/brand.hiboutik.dto.ts

@@ -0,0 +1,7 @@
+/** Brand as returned by Hiboutik `GET /brands`. */
+export interface BrandHiboutikDto {
+  brand_id: number;
+  brand_name: string;
+  /** 1 = enabled, 0 = disabled. */
+  brand_enabled: number;
+}