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/browser-extension/src/platforms.ts

@@ -136,6 +136,8 @@ export function buildPublishedUrl(platformId: string, externalArticleId: string)
       return `https://zhuanlan.zhihu.com/p/${externalArticleId}`;
     case "jianshu":
       return `https://www.jianshu.com/p/${externalArticleId}`;
+    case "baijiahao":
+      return `https://baijiahao.baidu.com/s?id=${externalArticleId}`;
     default:
       return null;
   }