文档：新增插件加载与卸载事件钩子文档

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• Upstream PR: feat: add plugin load&unload hook AstrBot#5331
• Trigger: PR merged

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AI change summary:

• 在 dev/star/guides/listen-message-event.md 的“事件钩子”章节新增插件生命周期钩子文档。
• 新增 on_plugin_loaded 钩子：当插件加载完成时触发，可获取 StarMetadata。
• 新增 on_plugin_unloaded 钩子：当插件卸载完成时触发，可获取 StarMetadata。
• i18n：中英文文档均已更新。

Please review manually before merging.

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• It does not represent the final documentation form.

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