docs: Unify documentation links

[Rain-0x01-39]

astrbot.app -> docs.astrbot.app

Modifications / 改动点

修改一些可能错误的链接，然后没了。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Documentation:

• Update all in-app and CLI documentation links from astrbot.app to docs.astrbot.app for knowledge base, custom rules, and general plugin documentation.

[gemini-code-assist]

Code Review

This pull request updates documentation links across the backend and frontend codebases, migrating them from the main domain to the dedicated documentation subdomain (docs.astrbot.app). These updates ensure that users are directed to the correct documentation pages from the CLI, core configuration, and various dashboard components. I have no feedback to provide.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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