feat(admin): Phase 6 AI任务监控+成本异常 — 全局任务列/筛/详情抽屉/失败重投

后端:adminpanel tasks(全局 AITask + status/type/team/anomaly 筛分页)+ detail(payload)+ retry(失败重投,
仅图像类 best-effort 否则 400);is_cost_anomaly(实际>预估×1.5)+ F() 异常筛;IsPlatformAdmin + 审计。
前端:adminApi tasks 系列;Admin 任务监控页(状态 tab + 仅成本异常 chip + 表格成本预估→实际+异常标 + 详情抽屉 payload + 失败重投)。
修真 bug:抽屉缺 .show 类停屏外,补上正常滑入。
测试:adminpanel 36 单测过(筛/异常/详情/重投 mock celery + 非失败/不支持/权限拒);
无头 e2e _admin-p6.mjs 6 断言过 + 0 console error(不点真重投);tsc+build 绿。

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

core/backend/apps/adminpanel/urls.py

@@ -5,6 +5,9 @@ from .views import (
     admin_asset_reviews_poll,
     admin_asset_reviews_submit,
     admin_invitations,
+    admin_task_detail,
+    admin_task_retry,
+    admin_tasks,
     admin_quality_word_detail,
     admin_quality_words,
     admin_revoke_invitation,
@@ -31,4 +34,7 @@ urlpatterns = [
     path("asset-reviews/", admin_asset_reviews, name="admin-asset-reviews"),
     path("asset-reviews/submit/", admin_asset_reviews_submit, name="admin-asset-reviews-submit"),
     path("asset-reviews/poll/", admin_asset_reviews_poll, name="admin-asset-reviews-poll"),
+    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"),
 ]