feat: add receiptName field to InventoryItem model and update related DTOs and service

backend/src/inventory/dto/create-inventory.dto.ts

@@ -36,6 +36,10 @@ export class CreateInventoryDto {
   @IsString()
   brand?: string;
 
+  @IsOptional()
+  @IsString()
+  receiptName?: string;
+
   @IsOptional()
   @IsBoolean()
   opened?: boolean;

backend/src/inventory/dto/update-inventory.dto.ts

@@ -39,6 +39,10 @@ export class UpdateInventoryDto {
   @IsString()
   brand?: string;
 
+  @IsOptional()
+  @IsString()
+  receiptName?: string;
+
   @IsOptional()
   @IsBoolean()
   opened?: boolean;

backend/src/inventory/inventory.service.ts

@@ -143,6 +143,7 @@ export class InventoryService {
       quantity: new Prisma.Decimal(data.quantity),
       location: data.location?.trim() || undefined,
       brand: data.brand?.trim() || undefined,
+      receiptName: data.receiptName?.trim() || undefined,
       suitableFor: data.suitableFor?.trim() || undefined,
       comment: data.comment?.trim() || undefined,
       purchaseDate: data.purchaseDate
@@ -200,6 +201,10 @@ export class InventoryService {
     if (typeof data.brand === 'string') {
       updateData.brand = data.brand.trim();
     }
+
+    if (typeof data.receiptName === 'string') {
+      updateData.receiptName = data.receiptName.trim();
+    }
     
     if (typeof data.priority === 'number') {
       updateData.priority = data.priority;