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/main/account-health.ts

@@ -558,7 +558,11 @@ export async function ensureAccountReady(
     return snapshot;
   }
 
-  if (snapshot && ["expired", "challenge_required", "revoked"].includes(snapshot.authState)) {
+  if (
+    snapshot
+    && ["expired", "challenge_required", "revoked"].includes(snapshot.authState)
+    && !(account.platform === "baijiahao" && snapshot.authState === "challenge_required")
+  ) {
     return snapshot;
   }