feat(provider): add Authgear provider

[buildbro]

☕️ Reasoning

Add Authgear to providers

🧢 Checklist

• [x] Documentation
• [x] Tests
• [x] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

[vercel[bot]]

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

Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 28, 2025 11:38am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
next-auth-docs	⬜️ Ignored (Inspect)	Visit Preview		May 28, 2025 11:38am

[vercel[bot]]

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