feat: purchase order item model

business/migrations/0003_purchaseorder_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.7 on 2025-11-27 07:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('business', '0002_remove_purchaseorder_order_date_purchaseorder_kind_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchaseorder',
+            name='status',
+            field=models.IntegerField(choices=[(1, '审批中'), (2, '审批通过'), (3, '作废')], default=1, verbose_name='状态'),
+        ),
+    ]