feat: added print_count api, added merchant setting model, added manual mode setting for purchase order

basic_info/migrations/0014_merchantsetting.py

@@ -0,0 +1,30 @@
+# Generated by Django 5.2.7 on 2025-11-28 06:00
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('basic_info', '0013_alter_customer_options'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='MerchantSetting',
+            fields=[
+                ('created_at', models.DateTimeField(auto_now_add=True, verbose_name='创建时间')),
+                ('updated_at', models.DateTimeField(auto_now=True, verbose_name='更新时间')),
+                ('id', models.BigAutoField(primary_key=True, serialize=False)),
+                ('key', models.CharField(max_length=100, verbose_name='设置项')),
+                ('val', models.CharField(max_length=100, verbose_name='设置值')),
+                ('description', models.TextField(blank=True, null=True, verbose_name='备注')),
+                ('merchant', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='settings', to='basic_info.merchant', verbose_name='所属商户')),
+            ],
+            options={
+                'verbose_name': '商户设置',
+                'verbose_name_plural': '商户设置',
+            },
+        ),
+    ]