feat(model_catalog): add Azure AI Foundry GPT-5.4 model metadata

[shivamrawat1]

Adding gpt-5.4 azure_ai support

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[greptile-apps]

Greptile Summary

This PR adds metadata for the Azure AI Foundry GPT-5.4 model family — eight entries covering base, pro, mini, and nano variants along with their dated snapshots — to both the primary and backup price/context-window JSON files.

• Each entry includes pricing (standard and priority tiers), _above_272k_tokens tiered costs, capability flags (supports_web_search, supports_service_tier, supports_reasoning, etc.), and token limits. All issues raised in earlier review rounds — missing supports_web_search on gpt-5.4, missing priority cost fields on gpt-5.4-pro, and missing _above_272k_tokens tiers on mini/nano — are resolved in this commit.
• gpt-5.4-pro (and its dated variant) correctly use "mode": "responses" and omit /v1/chat/completions from supported_endpoints, consistent with other responses-only models in the file. Both JSON files are in sync.

Confidence Score: 5/5

Additive-only JSON metadata change with no runtime logic modifications; both files are in sync and all previously identified gaps have been filled.

The change is purely additive — new model entries in two JSON catalog files. All capability flags, tiered pricing fields, and cross-file consistency issues surfaced in prior review rounds have been corrected in this commit. No existing entries are modified, and no code paths are touched.

No files require special attention.

Important Files Changed

Filename	Overview
model_prices_and_context_window.json	Adds 8 new Azure AI Foundry GPT-5.4 family entries with pricing, token limits, and capability flags; all previously raised issues are now addressed
litellm/model_prices_and_context_window_backup.json	Backup file receives the same 8 GPT-5.4 model entries as the primary file; both files are now in sync

_{Reviews (3): Last reviewed commit: "fix(model_catalog): sync web_search flag..." | Re-trigger Greptile}

[shivamrawat1]

@greptile review again with new commit that resolves the issues raised

[shivamrawat1]

@greptile review again with new commit that resolves the raised issue

[mateo-berri]

LGTM; thanks!