Add PNG social preview

Author: R2Phil-hub

README.md

@@ -289,7 +289,7 @@ npm run bridge:restart
 - Topics:
   `codex`, `feishu`, `lark`, `agent`, `local-first`, `approval-workflow`, `cron`, `automation`, `skills`, `typescript`
 - Social Preview:
-  use [assets/social-preview.svg](./assets/social-preview.svg)
+  use [assets/social-preview.png](./assets/social-preview.png)
 
 ## 适合谁
 

assets/social-preview.png

@@ -14,7 +14,7 @@
 ## Social Preview
 
 - 推荐上传：
-  [assets/social-preview.svg](../assets/social-preview.svg)
+  [assets/social-preview.png](../assets/social-preview.png)
 - 上传前确认：
   - 没有真实密钥
   - 没有本机路径

docs/GITHUB_SETTINGS_ZH.md

@@ -17,7 +17,7 @@
 - Topics:
   `codex`, `feishu`, `lark`, `agent`, `local-first`, `approval-workflow`, `cron`, `automation`, `skills`, `typescript`
 - Social Preview:
-  upload [assets/social-preview.svg](../assets/social-preview.svg)
+  upload [assets/social-preview.png](../assets/social-preview.png)
 
 ## 中文标题备选