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/frontend/src/api.ts

@@ -1,5 +1,7 @@
 import type {
+  AdminLedger,
   AdminQualityWord,
+  AdminQuotaPolicy,
   AdminReviewAsset,
   AdminTask,
   AdminTaskDetail,
@@ -618,5 +620,33 @@ export const adminApi = {
   },
   retryTask(id: string) {
     return request<{ retried: boolean; task_id: string }>(`/api/admin/tasks/${id}/retry/`, { method: "POST" });
+  },
+  ledgers(params?: { ledger_type?: string; team?: string; page?: number; page_size?: number }) {
+    const qs = new URLSearchParams();
+    if (params?.ledger_type) qs.set("ledger_type", params.ledger_type);
+    if (params?.team) qs.set("team", params.team);
+    if (params?.page) qs.set("page", String(params.page));
+    if (params?.page_size) qs.set("page_size", String(params.page_size));
+    const q = qs.toString();
+    return request<Paginated<AdminLedger>>(`/api/admin/ledgers/${q ? `?${q}` : ""}`);
+  },
+  adjustCredit(payload: { team: string; amount: string; reason: string }) {
+    return request<AdminLedger>("/api/admin/ledgers/adjust/", { method: "POST", body: JSON.stringify(payload) });
+  },
+  quotaPolicies(params?: { team?: string; page_size?: number }) {
+    const qs = new URLSearchParams();
+    if (params?.team) qs.set("team", params.team);
+    if (params?.page_size) qs.set("page_size", String(params.page_size));
+    const q = qs.toString();
+    return request<Paginated<AdminQuotaPolicy>>(`/api/admin/quota-policies/${q ? `?${q}` : ""}`);
+  },
+  createQuotaPolicy(payload: { team: string; monthly_limit?: string | null; project_limit?: string | null; per_task_limit?: string | null; is_active?: boolean }) {
+    return request<AdminQuotaPolicy>("/api/admin/quota-policies/", { method: "POST", body: JSON.stringify(payload) });
+  },
+  updateQuotaPolicy(id: string, payload: { monthly_limit?: string | null; project_limit?: string | null; per_task_limit?: string | null; is_active?: boolean }) {
+    return request<AdminQuotaPolicy>(`/api/admin/quota-policies/${id}/`, { method: "PATCH", body: JSON.stringify(payload) });
+  },
+  deleteQuotaPolicy(id: string) {
+    return request<void>(`/api/admin/quota-policies/${id}/`, { method: "DELETE" });
   }
 };