feat(web): 增加计费结算异常管理界面

管理端支持按状态查看结算与释放记录，展示精确到九位的小数金额、错误分类和重试次数，并使用一次性 Idempotency-Key 发起审计化重试。

packages/contracts/src/index.ts

@@ -1156,6 +1156,15 @@ export interface GatewayTask {
   metrics?: Record<string, unknown>;
   billingSummary?: Record<string, unknown>;
   finalChargeAmount?: number;
+  billingVersion?: string;
+  billingStatus?: 'not_started' | 'pending' | 'processing' | 'settled' | 'released' | 'retryable_failed' | 'manual_review' | 'not_required' | string;
+  billingCurrency?: string;
+  pricingSnapshot?: Record<string, unknown>;
+  requestFingerprint?: string;
+  reservationAmount?: number;
+  executionLeaseExpiresAt?: string;
+  billingUpdatedAt?: string;
+  billingSettledAt?: string;
   responseStartedAt?: string;
   responseFinishedAt?: string;
   responseDurationMs?: number;
@@ -1212,12 +1221,49 @@ export interface GatewayTaskAttempt {
   responseStartedAt?: string;
   responseFinishedAt?: string;
   responseDurationMs?: number;
+  pricingSnapshot?: Record<string, unknown>;
+  requestFingerprint?: string;
+  upstreamSubmissionStatus?: 'not_submitted' | 'submitting' | 'response_received' | string;
+  upstreamSubmissionUpdatedAt?: string;
   errorCode?: string;
   errorMessage?: string;
   startedAt: string;
   finishedAt?: string;
 }
 
+export interface BillingSettlement {
+  id: string;
+  taskId: string;
+  action: 'settle' | 'release' | string;
+  amount: number;
+  currency: string;
+  status: 'pending' | 'processing' | 'retryable_failed' | 'completed' | 'manual_review' | string;
+  attempts: number;
+  nextAttemptAt: string;
+  lockedBy?: string;
+  lockedAt?: string;
+  lastErrorCode?: string;
+  lastErrorMessage?: string;
+  manualReviewReason?: string;
+  pricingSnapshot?: Record<string, unknown>;
+  payload?: Record<string, unknown>;
+  completedAt?: string;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface BillingSettlementListResponse {
+  items: BillingSettlement[];
+  total: number;
+  page: number;
+  pageSize: number;
+}
+
+export interface BillingSettlementRetryResponse {
+  settlement: BillingSettlement;
+  auditLog?: GatewayAuditLog;
+}
+
 export interface GatewayTaskEvent {
   id: string;
   taskId: string;