🐞 fix: 修复'退出登录'判断条件

[baiyunjian]

原先的判断逻辑未考虑到用户未配置密码时应不显示导航栏“退出登录”的选项，此时用户点击“退出登录”后，将进入登录界面。通过加入 hasPassword 的 boolean 值判断，在不暴露 .env 设定密码的前提下，实现未登录状态下“退出登录”选项的隐藏。

[gemini-code-assist]

Summary of Changes

Hello @baiyunjian, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决当用户未配置密码时，“退出登录”选项仍会显示在导航栏中的问题。原先的逻辑会导致用户点击该选项后意外跳转到登录页面。通过引入一个 hasPassword 配置项，并将其纳入“退出登录”选项的显示条件中，确保了在未设置密码的情况下，该选项将不再显示，从而提升了用户体验和逻辑一致性。

Highlights

• 修复“退出登录”显示逻辑: 修正了导航栏中“退出登录”选项的显示条件，使其仅在用户已登录且配置了密码时才显示。
• 引入 hasPassword 配置: 在 Nuxt 配置中新增了一个 hasPassword 布尔值，用于判断是否设置了站点密码，从而控制“退出登录”选项的可见性。

Changelog

• app/components/SiteNav.vue
  • 更新了“退出登录”菜单项的显示条件，增加了对 config.public.hasPassword 的判断。
• nuxt.config.ts
  • 在公共配置中添加了 hasPassword 属性，其值根据 process.env.SITE_PASSWORD 是否存在来确定。

Activity

• 目前没有人工活动。

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[gemini-code-assist]

Code Review

本次 PR 修复了在未设置站点密码时仍然显示“退出登录”按钮的逻辑问题。通过在 Nuxt 配置中新增一个 hasPassword 标志，并在导航组件中根据此标志和登录状态来控制“退出登录”按钮的显示，有效地解决了该问题。整体实现思路清晰，代码改动准确。我发现一处可以改进的地方以增加代码的健壮性，请查看具体评论。

[gemini-code-assist]

当前 !!process.env.SITE_PASSWORD 的逻辑在 SITE_PASSWORD 环境变量仅包含空格（例如 " "）时，hasPassword 会被设为 true。这可能不是预期的行为，因为一个只包含空格的密码通常被认为是无效的。建议在检查之前先对字符串进行 trim() 操作，以处理这种边缘情况，增强代码的健壮性。

Suggested change

	hasPassword: !!process.env.SITE_PASSWORD,
	hasPassword: !!process.env.SITE_PASSWORD?.trim(),