📝 Add docstrings to feat/trino-external-auth

[coderabbitai]

Docstrings generation was requested by @lineardevon.

• feat: add Trino external authentication (browser OAuth) #136 (comment)

The following files were modified:

• cmd/main.go
• internal/config/config.go
• internal/trino/client.go
• internal/trino/external_auth.go

These files were ignored

• internal/config/config_test.go
• internal/trino/client_reauth_test.go
• internal/trino/external_auth_test.go

These file types are not supported

• CLAUDE.md
• README.md
• docs/deployment.md

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[coderabbitai]

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[github-actions]

Identified one logic issue in the new external-auth flow related to TLS handling; see inline comment.

[github-actions]

⚠️ Logic This HTTP client always uses the default TLS verifier, so TRINO_SSL_INSECURE / custom CA settings are ignored during the OAuth handshake. Clusters with self-signed certs cannot complete external auth; please build this client with the same TLS configuration as the main Trino connection or propagate the SSLInsecure flag.

[lineardevon]

Sorry, thought this would be a commit in the original PR where it was requested. Please close.