更新 WebChat 附件存储路径说明与数据目录结构文档

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Generated automatically by astrbot-docs-agent-server.

• Upstream PR: fix: chatui cannot persist file segment AstrBot#5386
• Trigger: PR merged

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AI change summary:

• 更新 zh/faq.md 与 en/faq.md，新增 WebChat 附件存储路径说明，明确附件统一存储于 data/attachments/ 目录。
• 更新 zh/dev/star/guides/storage.md 与 en/dev/star/guides/storage.md，新增数据目录结构表格，说明 attachments/ 目录用途及旧版 webchat/imgs/ 目录废弃情况。
• i18n 状态：中英文文档均已同步更新。

Please review manually before merging.

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

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