refactor(publish): collapse pending_review/unknown task states into failed

Treat ambiguous terminal states as failures end-to-end: server
normalizes unknown desktop task completions and views to failed, drops
the pending_review aggregate branch, and remaps pending_review to
failed in publish record conversion. admin-web removes the
pending_review status option from article list filters, pushes
pending_review through the failed tone, and folds lingering
publishing/pending entries under the publishing bucket. desktop-client
relabels unknown as 发送失败 in PublishManagement/TasksView, rewrites
the scaffold adapter result to a proper failed error envelope, and
sanitises legacy scaffold-only error messages to a user-friendly note.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/views/FreeCreateView.vue

@@ -111,7 +111,6 @@ const publishStatusOptions = computed(() => [
   { label: getPublishStatusMeta("success").label, value: "success" },
   { label: getPublishStatusMeta("partial_success").label, value: "partial_success" },
   { label: getPublishStatusMeta("failed").label, value: "failed" },
-  { label: getPublishStatusMeta("pending_review").label, value: "pending_review" },
 ]);
 
 const articleColumns = computed<TableColumnsType<ArticleListItem>>(() => [