feat(publish): add baijiahao and jianshu desktop adapters

Wires up Baijiahao (百家号) and Jianshu (简书) as first-class desktop
publish targets, with risk-control prompts surfaced in the runtime
controller and a normalized error message in publish records. Adds
external-link buttons in the publish management table, an asset
format conversion endpoint for cover image compatibility, and
reorders publish-status display priority so failures take precedence
over partial successes.

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

apps/desktop-client/src/preload/bridge.ts

@@ -101,6 +101,8 @@ const desktopBridge = {
       ipcRenderer.invoke("desktop:list-publish-tasks", params) as Promise<DesktopPublishTaskListResponse>,
     retryPublishTask: (taskId: string) =>
       ipcRenderer.invoke("desktop:retry-publish-task", taskId) as Promise<CreatePublishJobResponse>,
+    openExternalUrl: (url: string) =>
+      ipcRenderer.invoke("desktop:open-external-url", url) as Promise<null>,
     syncRuntimeSession: (session: DesktopRuntimeSessionSyncRequest | null) =>
       ipcRenderer.invoke("desktop:runtime-session-sync", session) as Promise<null>,
     releaseRuntimeSession: (revoke?: boolean) =>