docs: 重写 README 界面预览,换新 UI 的 1920×1080 截图

- hero 图换成新首页;预览网格改为画图台/概览/模型/渠道/用户/日志六张
- 删除账号池时代的 accounts.png,新增 channels.png、users.png
- 去掉"深/浅双主题"描述(现为固定浅色),用户端补"无限画布"
- README.en.md 补上此前缺失的截图区,与中文版对齐

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This commit is contained in:
2026-10-27 18:32:31 +08:00
co-authored by Devin
parent d37ca69f77
commit 1753e03898
10 changed files with 48 additions and 5 deletions
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