fix(test-round): 测试清单一批 bug 修复 + 团队月限额持久化

后端:
- accounts: 团队级月限额持久化(Team.monthly_credit_limit 三态 + PATCH/GET
  /api/auth/team/settings/,刷新不丢,PMC#12);头像上传 500→502 可读错误;
  设备下线真失效(删并重建 token,旧 token 401)
- assets: 审核类目加 model_portrait,消除三视图"无需审核"误报
- ai/projects/products: 模特已有三视图复用、产品三视图同步回商品库
  (metadata.view=three_view)、真人模特三视图回写

前端:
- 商品图删除判断改用真实图片数;团队成员弹窗禁点外部关闭
- 图片预览骨架铺满占位;平台套图左侧栏折叠改导航同款;收件箱长文换行对齐
- 团队月限额改真落库(乐观更新+失败回滚)

测试:新增 TeamSettingsTests(5 条),accounts 全套 36 tests 通过;前端 build 0 error

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

core/backend/apps/accounts/migrations/0007_team_monthly_credit_limit.py

@@ -0,0 +1,20 @@
+# Generated by Django 5.1.15 on 2026-06-29 10:44
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("accounts", "0006_teammember_daily_credit_limit_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="team",
+            name="monthly_credit_limit",
+            field=models.DecimalField(
+                blank=True, decimal_places=2, default=None, max_digits=12, null=True
+            ),
+        ),
+    ]