feat: added area field into shipments model

shipment/migrations/0008_add_area_to_shipment.py

@@ -0,0 +1,17 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shipment', '0007_add_remark_to_external_finished_product'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='shipment',
+            name='area',
+            field=models.CharField(blank=True, default='', help_text='出货地区（可空字符串）', max_length=30, verbose_name='地区'),
+        ),
+    ]
+