docs(provider): note the canonical ai-gateway path

[pawbana]

Adds information about /api/v2/ai-gateway path from Coder v2.35 to docs / comments.
Legacy aibridge path is still used as default.

[ThomasK33]

@codex review

[ThomasK33]

@codex security review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-16T11:13:19.455981Z	b05b90e	Manual request
🔒 Security Review	✅ Completed 2026-09-16T11:13:37.318106Z	b05b90e	Manual request

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: b05b90ef68

ℹ️ About Codex in GitHub

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[chatgpt-codex-connector]

🛡️ Codex Security Review

Security review completed. No security issues were found in this pull request.

Reviewed commit: b05b90ef68

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