Retain allowlisted legacy model IDs

[chrarnoldus]

Summary

• partially revert fix: remove legacy OpenRouter alias handling #5943 by restoring legacy OpenRouter aliases that appear in the provided allowlist
• retain hardcoded OpenRouter-to-Vercel mappings for allowlisted source IDs plus the two Mistral embedding IDs
• exclude the two OpenAI transcription IDs from the legacy alias set
• cover retained aliases, removed aliases, and mapping exceptions

Testing

• Not run locally; CI will handle validation as requested.
• git diff --check
• formatted the four changed files with oxfmt

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• apps/web/src/lib/ai-gateway/providers/gateway-models-cache.ts
• apps/web/src/lib/ai-gateway/providers/gateway-models-cache.test.ts
• apps/web/src/lib/ai-gateway/providers/vercel/mapModelIdToVercel.ts
• apps/web/src/lib/ai-gateway/providers/vercel/mapModelIdToVercel.test.ts

Previous Review Summary (commit 20df468)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 20df468)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• apps/web/src/lib/ai-gateway/providers/gateway-models-cache.ts
• apps/web/src/lib/ai-gateway/providers/gateway-models-cache.test.ts
• apps/web/src/lib/ai-gateway/providers/vercel/mapModelIdToVercel.ts
• apps/web/src/lib/ai-gateway/providers/vercel/mapModelIdToVercel.test.ts

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_{Review guidance: REVIEW.md from base branch main}