文档更新：新增 UTF-8 BOM 编码报错 FAQ

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Generated automatically by astrbot-docs-agent-server.

• Upstream PR: fix: 处理配置文件中的 UTF-8 BOM 编码问题 AstrBot#5376
• Trigger: PR merged

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AI change summary:

• zh/faq.md：新增「启动时报错 JSONDecodeError: Unexpected UTF-8 BOM」FAQ，说明原因（Windows 记事本保存添加 BOM）及解决方法。
• en/faq.md：同步新增对应英文 FAQ 条目。
• i18n：中英文文档同步更新。

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.

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