fix: align sdk codex auth imports with internal types

[KooshaPari]

Summary

• switch sdk codex login imports from pkg llmproxy auth stack to internal auth stack
• align sdk/auth/codex.go with buildAuthRecord signature in sdk/auth/codex_device.go

Why

PR #617 fails CodeQL/go build because buildAuthRecord expects internal/auth/codex types while sdk/auth/codex.go constructed pkg/llmproxy/auth/codex types.

Validation

• fixes compile-time type mismatch in CI for sdk/auth/codex.go

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📥 Commits

Reviewing files that changed from the base of the PR and between 6e7b545 and 30d3b9f.

📒 Files selected for processing (1)

• sdk/auth/codex.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/pr617-main-ci-fix1

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[KooshaPari]

Superseded by #621 and #622; closing this PR in favor of the merged replacements.