Add token types documentation to authentication

[mintlify]

Added comprehensive documentation on authentication token types including access tokens, API keys, bearer tokens, and JWT tokens. Also added security best practices and troubleshooting guide for common token-related issues.

Files changed

• deploy/authentication-setup.mdx - Added three new sections: "Understanding token types", "Token security best practices", and "Common token-related issues"

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Note

Extends authentication docs with configuration guidance, examples, and troubleshooting to aid setup and debugging.

• Adds Understanding token types covering OAuth access tokens, API keys, bearer tokens, and JWTs with example requests and backend validation snippets
• Introduces Token security best practices (secret handling, token/session lifetimes, verification, endpoint hardening, refresh) with example jose validation code
• Adds Common token-related issues (invalid tokens, OAuth callback failures, Info API errors, JWT signature verification, session expiration) with CLI/tests and fix patterns
• Clarifies where to configure values in dashboard vs backend and links to related User data format and settings

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