docs(auth): document X-Tinyauth-Authorization header for Basic-auth apps

[manysuq]

Follows up on tinyauthapp/tinyauth#1126, which adds the X-Tinyauth-Authorization header for apps that use Authorization with the Basic scheme for their own auth.

Documents the new header in the Basic Authentication reference: same Basic base64(username:password) format, X-Tinyauth-Authorization takes precedence so the upstream app keeps its original Authorization, and a malformed header returns 401 instead of falling back to Authorization.

Verified against the PR head (middleware in internal/middleware/context_middleware.go): X-Tinyauth-Authorization is checked first and returns on auth, while the regular Authorization flow is preserved.

[coderabbitai]

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