feat: 中文化 django-admin 分组与表名 (T-602 层1-3)

- 5 个 app 加 AppConfig.verbose_name(中文分组名)
- 11 个模型加 Meta.verbose_name/verbose_name_plural(中文表名)
- 3 条 AlterModelOptions 迁移(仅 options,无 DB schema 变更)
- LANGUAGE_CODE=zh-hans / USE_I18N=True 已在,Django 自带 admin 与 auth 已中文
- 仅显示层，不改字段名/逻辑/表结构

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/billing/migrations/0005_alter_callrecord_options_alter_exchangerate_options_and_more.py

@@ -0,0 +1,33 @@
+# Generated by Django 5.2.15 on 2026-07-04 07:08
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('billing', '0004_rechargeorder_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='callrecord',
+            options={'ordering': ('-created_at', '-id'), 'verbose_name': '调用记录', 'verbose_name_plural': '调用记录'},
+        ),
+        migrations.AlterModelOptions(
+            name='exchangerate',
+            options={'ordering': ('-effective_from', '-id'), 'verbose_name': '汇率', 'verbose_name_plural': '汇率'},
+        ),
+        migrations.AlterModelOptions(
+            name='pointsledger',
+            options={'ordering': ('-created_at', '-id'), 'verbose_name': '点数流水', 'verbose_name_plural': '点数流水'},
+        ),
+        migrations.AlterModelOptions(
+            name='pricingrule',
+            options={'ordering': ('operation_type', 'alias', 'resolution'), 'verbose_name': '计费规则', 'verbose_name_plural': '计费规则'},
+        ),
+        migrations.AlterModelOptions(
+            name='rechargeorder',
+            options={'ordering': ('-created_at', '-id'), 'verbose_name': '充值订单', 'verbose_name_plural': '充值订单'},
+        ),
+    ]