fix(readme): 修复 README 破损图片引用

[appergb]

Resources/AppIcon.png 已删除，README hero 图改指 Tauri icon 128x128@2x.png。

Summary by Sourcery

Documentation:

• Update the English and Chinese README files to use the new Tauri app icon image instead of the removed Resources/AppIcon asset.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Update README hero image paths to point to the existing Tauri app icon instead of a removed Resources/AppIcon.png file in both English and Chinese READMEs.

File-Level Changes

Change	Details	Files
Update broken README hero image references to use the Tauri app icon path.	Replace hero image src path in README with openless-all/app/src-tauri/icons/128x128@2x.png. Replace hero image src path in README.zh.md with openless-all/app/src-tauri/icons/128x128@2x.png.	README.md README.zh.md

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