feat: add cose extension

[timerring]

Summary

Add integration with COSE (Create Once, Sync Everywhere) browser extension for one-click article publishing to multiple platforms.

fix #1116 #856 #864 #1033 #835 #793

Changes

• PostInfo.vue:

  • Add publish button with Send icon in editor header
  • Add extension detection and installation prompt with Chrome Web Store link
  • Display platform login status with avatar and username
  • Add "登录" for clearer UX when not logged in

• PostTaskDialog.vue: Update sync task dialog UI

• common.ts: Add loggedIn, status, and error fields to PostAccount type for tracking platform authentication state

Supported Platforms

• CSDN
• Juejin (掘金)
• WeChat Official Account (微信公众号)

How It Works

Check Youtube Link: https://www.youtube.com/watch?v=KTskiA8Xaj4

[github-actions[bot]]

🚀 Surge Preview has been successfully deployed!

Preview URL: https://doocs-md-preview-pr-1181.surge.sh

_{Built with commit 2cef0ab7dd03eae29e56da0175d8258e0c531f57}