升级外部生成为正式任务列表

将 external_generation_job 扩展为含价格、确认时间、退款流水和事件审计的正式生成任务事实源

新增外部生成任务列表与确认 BFF，并让平台入口按后端任务补弹完成或失败提示

保护画布生成队列超时、快照回写和自动保存覆盖场景

将 worker 计费退款流水写入 externalGenerationJobId，并补充冷备份后 worker/controller 恢复守护

src/components/platform-entry/platformDialogStateModel.ts

@@ -13,6 +13,7 @@ export type PlatformTaskCompletionDialogState =
   PlatformTaskCompletionDialogPayload & {
     key: string;
     completedAtMs: number | null;
+    taskJobIds?: string[];
   };
 
 export type PlatformDialogCandidate = {
@@ -68,7 +69,7 @@ export function buildPlatformTaskCompletionDialogDismissKey(
   completion: PlatformTaskCompletionDialogState | null,
 ) {
   return completion
-    ? `${completion.key}:${completion.source}:${completion.message}:${completion.completedAtMs ?? 0}`
+    ? `${completion.key}:${completion.source}:${completion.message}:${completion.completedAtMs ?? 0}:${completion.taskJobIds?.join(',') ?? ''}`
     : null;
 }