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/desktop-client/src/main/runtime-controller.ts

@@ -1002,7 +1002,7 @@ function buildScaffoldResult(
   detail: string,
 ): AdapterExecutionResult {
   return {
-    status: "unknown",
+    status: "failed",
     payload: {
       ...adapterPayload,
       runtime_mode: "desktop-scaffold",
@@ -1010,11 +1010,11 @@ function buildScaffoldResult(
       task_platform: task.platform,
     },
     error: {
-      code: "desktop_task_scaffold_only",
-      message: "desktop runtime adapter is scaffold-only and requires later reconcile",
+      code: "desktop_task_adapter_missing",
+      message: "desktop runtime adapter is not implemented for this platform",
       detail,
     },
-    summary: `${task.title} 已被 desktop runtime 消费，但当前 adapter 仍是 scaffold，仅回写 unknown 供后续 reconcile。`,
+    summary: `${task.title} 执行失败：当前平台的 desktop 发布适配器尚未实现。`,
   };
 }
 
@@ -1237,7 +1237,7 @@ function summaryFromTaskStatus(status: RuntimeTaskStatus): string {
     case "aborted":
       return "任务已被取消。";
     default:
-      return "任务进入 unknown/reconcile 分支，等待进一步确认。";
+      return "任务执行异常，已按失败处理。";
   }
 }