[BOT ISSUE] OpenAI: mark `dall-e-2`, `dall-e-3`, `gpt-4o-audio-preview` as deprecated

[github-actions]

Stale deprecation metadata

The following models have already passed their OpenAI shutdown dates (per the deprecations page) but are not marked as deprecated in packages/proxy/schema/model_list.json.

Models to update

Model ID	Shutdown date	Replacement
dall-e-2 (+ size variants)	2026-05-12	gpt-image-2 / gpt-image-1
dall-e-3 (+ quality/size variants)	2026-05-12	gpt-image-2 / gpt-image-1
gpt-4o-audio-preview	2026-05-07	gpt-audio-1.5

All three shutdown dates have already passed (today is 2026-05-20).

Suggested change

Add deprecated: true and deprecation_date to each entry. Example for dall-e-3 (line ~10415):

"deprecated": true,
"deprecation_date": "2026-05-12"

For gpt-4o-audio-preview (line ~1145):

"deprecated": true,
"deprecation_date": "2026-05-07"

The dall-e variants to update: dall-e-2, 256-x-256/dall-e-2, 512-x-512/dall-e-2, 1024-x-1024/dall-e-2, dall-e-3, hd/1024-x-1024/dall-e-3, hd/1024-x-1792/dall-e-3, hd/1792-x-1024/dall-e-3, standard/1024-x-1024/dall-e-3, standard/1024-x-1792/dall-e-3, standard/1792-x-1024/dall-e-3.

Verification checklist

• Cross-source: Deprecation confirmed on OpenAI API deprecations page; shutdown dates have already passed
• Recent commits: No recent commit marks these as deprecated
• Existing issues: No existing issue covers these deprecation updates

[github-actions]

Autofix skipped because the issue body/title did not contain parseable bot metadata for a model catalog change.