feat: add product domain and machine integration

- extend Prisma schema with products, product constructs and link tables\n- introduce product service, DTOs and includes with constructeur support\n- integrate product selections across model type skeletons, composants, pièces and machines\n- validate product requirements when building machine skeletons and payloads

src/custom-fields/custom-fields.service.ts

@@ -36,6 +36,8 @@ export class CustomFieldsService {
         return 'composantId' as const;
       case CustomFieldEntityType.PIECE:
         return 'pieceId' as const;
+      case CustomFieldEntityType.PRODUCT:
+        return 'productId' as const;
       default:
         throw new BadRequestException(
           "Type d'entité de champ personnalisé invalide.",
@@ -114,6 +116,28 @@ export class CustomFieldsService {
           valueKey: 'pieceId' as const,
         };
       }
+      case CustomFieldEntityType.PRODUCT: {
+        const product = await this.prisma.product.findUnique({
+          where: { id: entityId },
+          select: { typeProductId: true },
+        });
+
+        if (!product) {
+          throw new NotFoundException('Produit introuvable.');
+        }
+
+        if (!product.typeProductId) {
+          throw new BadRequestException(
+            'Le produit ne possède pas de type associé pour les champs personnalisés.',
+          );
+        }
+
+        return {
+          typeId: product.typeProductId,
+          customFieldTypeField: 'typeProductId' as const,
+          valueKey: 'productId' as const,
+        };
+      }
       default:
         throw new BadRequestException(
           "Type d'entité de champ personnalisé invalide.",