💄 style: Add login ui for next-auth

[cy948]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

• src/app/[variants]/(auth)/next-auth/signin/AuthLoginPage.tsx: 依照 AuthJS 实现的登录UI
• src/app/[variants]/(auth)/next-auth/signin/page.tsx: 登录UI失败Fallback
• src/components/NextAuth/AuthIcons.tsx: 将 AuthIcons 抽离为组件
• src/libs/next-auth/auth.config.ts: 更改默认 signin url
• src/middleware.ts: 允许路由

📝 补充信息 | Additional Information

• Preview

https://lobe-chat-git-feat-signin-page-cy948s-projects.vercel.app/next-auth/signin

[vercel]

@cy948 is attempting to deploy a commit to the LobeChat Desktop Team on Vercel.

A member of the Team first needs to authorize it.

[lobehubbot]

👍 @cy948

Thank you for raising your pull request and contributing to our Community
Please make sure you have followed our contributing guidelines. We will review it as soon as possible.
If you encounter any problems, please feel free to connect with us.
非常感谢您提出拉取请求并为我们的社区做出贡献，请确保您已经遵循了我们的贡献指南，我们会尽快审查它。
如果您遇到任何问题，请随时与我们联系。

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.56%. Comparing base (5ee59e3) to head (cb6ece2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #6434     +/-   ##
=========================================
  Coverage   91.56%   91.56%             
=========================================
  Files         716      716             
  Lines       67242    67242             
  Branches     4512     3241   -1271     
=========================================
+ Hits        61572    61573      +1     
+ Misses       5670     5669      -1     

Flag	Coverage Δ
app	91.56% <ø> (+<0.01%)	⬆️
server	97.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
lobe-chat-database	✅ Ready (Inspect)	Visit Preview	Mar 3, 2025 4:08pm

[ZeroDeng01]

@arvinxx review并合并一下呗

[lobehubbot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

---

@arvinxx review and merge