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/ai/models.py

@@ -39,6 +39,8 @@ class AiModel(models.Model):
 
     class Meta:
         db_table = "ai_model"
+        verbose_name = "AI 模型"
+        verbose_name_plural = "AI 模型"
         ordering = ("name",)
 
     def __str__(self) -> str:
@@ -103,6 +105,8 @@ class ModelAlias(models.Model):
 
     class Meta:
         db_table = "model_alias"
+        verbose_name = "能力别名"
+        verbose_name_plural = "能力别名"
         ordering = ("operation_type", "alias")
         constraints = [
             models.UniqueConstraint(
@@ -163,6 +167,8 @@ class AiConfigAuditLog(models.Model):
 
     class Meta:
         db_table = "ai_config_audit_log"
+        verbose_name = "AI 配置审计日志"
+        verbose_name_plural = "AI 配置审计日志"
         ordering = ("-created_at", "-id")
         indexes = [
             models.Index(fields=("target_type", "target_id")),