Fix entity validation and data loading

src/components/admin/ManufacturerForm.tsx

@@ -87,6 +87,10 @@ export function ManufacturerForm({ onSubmit, onCancel, initialData }: Manufactur
               ...data,
               company_type: 'manufacturer' as const,
               founded_year: data.founded_year ? parseInt(String(data.founded_year)) : undefined,
+              banner_image_id: undefined,
+              banner_image_url: undefined,
+              card_image_id: undefined,
+              card_image_url: undefined,
             };
             
             await onSubmit(formData);