feat(admin): Phase 7 计费审计+4层额度策略 — 流水浏览/手动调额/额度策略CRUD+拦截

后端:adminpanel ledgers(全局流水+筛)+ adjust(手动调额,落 ADJUSTMENT)+ quota-policies CRUD;
额度拦截 _enforce_quota_policy(单任务/月度/项目)接入 reserve_credit,仅团队有 active 策略才生效(无策略零回归);
adjust_credit helper。修真 bug:log_admin_action 加 savepoint + JSON 安全化(UUID/Decimal),
修复传 serializer.data 致审计报错污染外层事务 → TransactionManagementError。
前端:adminApi 计费/额度系列;计费审计页(流水表+手动调额弹窗)+ 额度策略页(CRUD 弹窗,团队下拉+三类上限+启用)。
测试:adminpanel 44 + billing + accounts = 70 单测过(调额±/超额拒/额度拦截 per_task+monthly/无策略零回归);
无头 e2e _admin-p7.mjs 6 断言过 + 0 console error(一次性团队,不动 demo 余额);tsc+build 绿。

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

core/backend/apps/adminpanel/urls.py

@@ -5,6 +5,10 @@ from .views import (
     admin_asset_reviews_poll,
     admin_asset_reviews_submit,
     admin_invitations,
+    admin_ledger_adjust,
+    admin_ledgers,
+    admin_quota_policies,
+    admin_quota_policy_detail,
     admin_task_detail,
     admin_task_retry,
     admin_tasks,
@@ -37,4 +41,8 @@ urlpatterns = [
     path("tasks/", admin_tasks, name="admin-tasks"),
     path("tasks/<uuid:task_id>/", admin_task_detail, name="admin-task-detail"),
     path("tasks/<uuid:task_id>/retry/", admin_task_retry, name="admin-task-retry"),
+    path("ledgers/", admin_ledgers, name="admin-ledgers"),
+    path("ledgers/adjust/", admin_ledger_adjust, name="admin-ledger-adjust"),
+    path("quota-policies/", admin_quota_policies, name="admin-quota-policies"),
+    path("quota-policies/<uuid:policy_id>/", admin_quota_policy_detail, name="admin-quota-policy-detail"),
 ]