feat: 分俱乐部付呗收款通道，默认仍走微信直连

小程序前端仍传 wechat；后台可切换 wechat/fubei，支持配置多套付呗并退款按原通道路由。

Co-authored-by: Cursor <cursoragent@cursor.com>

jituan/migrations/0014_club_mini_pay_channel_and_ledger.py

@@ -0,0 +1,41 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('jituan', '0013_club_pay_withdraw_split'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='club',
+            name='mini_pay_channel',
+            field=models.CharField(
+                blank=True,
+                default='wechat',
+                help_text='wechat=微信直连；fubei=付呗；默认 wechat，不影响现网',
+                max_length=16,
+                verbose_name='小程序收款通道',
+            ),
+        ),
+        migrations.CreateModel(
+            name='PayChannelLedger',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('out_trade_no', models.CharField(db_index=True, max_length=64, unique=True, verbose_name='商户订单号')),
+                ('club_id', models.CharField(db_index=True, default='', max_length=16)),
+                ('channel', models.CharField(db_index=True, max_length=32, verbose_name='通道')),
+                ('channel_config_id', models.IntegerField(blank=True, null=True)),
+                ('biz_type', models.CharField(blank=True, default='', max_length=16, verbose_name='order/czjilu')),
+                ('provider_order_sn', models.CharField(blank=True, default='', max_length=64, verbose_name='通道侧订单号')),
+                ('amount_yuan', models.DecimalField(decimal_places=2, default=0, max_digits=12)),
+                ('CreateTime', models.DateTimeField(auto_now_add=True)),
+                ('UpdateTime', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': '支付通道流水',
+                'db_table': 'pay_channel_ledger',
+            },
+        ),
+    ]