feat: purchase order item model

business/migrations/0007_alter_purchaseorderitem_batch_number.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.7 on 2025-11-27 08:45
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('business', '0006_remove_purchaseorderitem_total_amount'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='purchaseorderitem',
+            name='batch_number',
+            field=models.CharField(blank=True, max_length=100, null=True, verbose_name='批次号'),
+        ),
+    ]