[READ-ONLY] Mirror of https://github.com/okikio/docs.

Add comprehensive Authentication guide with OAuth 2.0, JWT, and security best practices master

- Complete authentication guide (1,319 lines) - Covers API Keys, Basic Auth, JWT/******, OAuth 2.0 - Includes password storage, MFA, session management - Security vulnerabilities and testing patterns - Grounded in RFCs 7235, 7617, 7519, 6749, 7636 Co-authored-by: okikio <17222836+okikio@users.noreply.github.com>


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