文档更新：支持插件加载失败后的热重载功能说明

[astrbot-doc-agent]

Generated automatically by astrbot-docs-agent-server.

• Upstream PR: feat:Support hot reload after plugin load failure AstrBot#5043
• Trigger: PR merged

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AI change summary:

• 更新了 zh/use/webui.md 与 en/use/webui.md，新增“插件加载失败处理”章节，介绍 WebUI 错误提示及一键重载功能。
• 更新了 zh/dev/star/plugin-new.md 与 en/dev/star/plugin-new.md，在调试插件章节补充了重载失败插件的操作说明，提升开发调试效率。
• 本次更新已同步完成中英文（zh/en）文档的对应修改。

Please review manually before merging.

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Experimental bot notice:

• This output is generated by AstrBot-Doc-Agent for review only.
• It does not represent the final documentation form.

[dosubot]

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