后端生成闸+多项修复;前端全站更新;QA 审计与报告

后端:
- 新增 celery_health 生成前置闸——无 worker 在线时图片/视频生成入口
  一律 503,防"提交到 ARK 后无人轮询、结果悬空+额度冻结"的数据丢失
- 拼接导出:帧率跟随源众数、字幕逐句重映射、原声/BGM 混音修复
- 资金核算审计脚本 + genesis 账目回填 + 滞留预留清理命令
- 接入 yunqi provider 与豆包 TTS 模型(catalog/migrations/bootstrap 命令)

前端:全站页面更新(pipeline/library/products/projects/team/account 等),
新增共享 pager 分页组件

QA:刷新 function-audit 全量输出,新增 full-qa 报告
文档:BP 产品介绍资料、design/CLAUDE.md

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/backend/apps/accounts/serializers.py

@@ -1,6 +1,6 @@
 from rest_framework import serializers
 
-from apps.billing.models import CreditAccount
+from apps.billing.models import CreditAccount, CreditLedger
 
 from .models import LoginSession, Team, TeamMember, User, UserPreference
 
@@ -82,10 +82,19 @@ class RegisterSerializer(serializers.Serializer):
                 owner=user,
             )
             TeamMember.objects.create(team=team, user=user, role=TeamMember.Role.OWNER)
-            CreditAccount.objects.create(
-                team=team,
-                balance=Decimal(str(settings.DEFAULT_TRIAL_CREDITS)),
-            )
+            trial = Decimal(str(settings.DEFAULT_TRIAL_CREDITS))
+            CreditAccount.objects.create(team=team, balance=trial)
+            # 开户赠送额度必须进流水,否则这笔钱在账单里查无凭证、无法对账(余额从第一条起就可追溯)
+            if trial > 0:
+                CreditLedger.objects.create(
+                    team=team,
+                    user=user,
+                    ledger_type=CreditLedger.Type.RECHARGE,
+                    amount=trial,
+                    balance_after=trial,
+                    reason="新用户试用额度赠送",
+                    metadata={"kind": "trial_grant"},
+                )
         return {"user": user, "team": team}