🐛 fix: fix wrong email linking in next-auth db adapter

[cy948]

💻 变更类型 | Change Type

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

🔀 变更说明 | Description of Change

• 🐛 src/libs/next-auth/adapter/index.ts: 修复当用户没有邮箱时，会根据邮箱用户链接到其他用户。
• 🧪 src/database/server/models/__tests__/nextauth.test.ts: 当存在一个没有邮箱的用户A时，再创建一个没有邮箱的用户不会自动链接到用户B。

📝 补充信息 | Additional Information

• fix [Bug] 使用 Casdoor 部署服务器版本，登录身份错乱 #4918
• 该PR合并后，将完全信任SSO Provider的身份验证，允许SSO Provider不向lobe提供email的情况下注册用户，可能存在风险。同时也使一键部署后默认能够匿名登录。 About Login, How can I make a guest login or anonymous login (use first then login), please ? 请问如何进行访客登录或匿名登录（先使用后登录）? #4844

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[lobehubbot]

👍 @cy948

Thank you for raising your pull request and contributing to our Community
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.07%. Comparing base (a502c17) to head (302ef8d).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #4919     +/-   ##
=========================================
  Coverage   92.07%   92.07%             
=========================================
  Files         527      527             
  Lines       40050    40060     +10     
  Branches     2489     3516   +1027     
=========================================
+ Hits        36877    36887     +10     
  Misses       3173     3173             

Flag	Coverage Δ
app	92.07% <ø> (+<0.01%)	⬆️
server	98.12% <ø> (ø)

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[lobehubbot]

❤️ Great PR @cy948 ❤️

The growth of project is inseparable from user feedback and contribution, thanks for your contribution! If you are interesting with the lobehub developer community, please join our discord and then dm @arvinxx or @canisminor1990. They will invite you to our private developer channel. We are talking about the lobe-chat development or sharing ai newsletter around the world.
项目的成长离不开用户反馈和贡献，感谢您的贡献! 如果您对 LobeHub 开发者社区感兴趣，请加入我们的 discord，然后私信 @arvinxx 或 @canisminor1990。他们会邀请您加入我们的私密开发者频道。我们将会讨论关于 Lobe Chat 的开发，分享和讨论全球范围内的 AI 消息。

[lobehubbot]

🎉 This PR is included in version 1.36.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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