fix(ai-gateway): normalize model ids for variants

[chrarnoldus]

Summary

• fall back to the normalized OpenRouter model ID when deriving reasoning variants
• preserve exact model metadata lookup precedence

Validation

• pnpm --filter web run typecheck passed
• pnpm exec oxfmt --list-different apps/web/src/lib/ai-gateway/providers/model-settings.ts passed
• git diff --check passed
• targeted Jest suites were attempted but could not run because the local test PostgreSQL and Redis services are unavailable

Untracked .kilo/design/ tooling files were intentionally excluded.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Single-line bug fix that adds a normalized-model-ID fallback to OpenRouter reasoning-variant lookup while preserving exact-match precedence; verified against normalizeModelId semantics and existing codebase conventions with high confidence.

Files Reviewed (1 files)

• apps/web/src/lib/ai-gateway/providers/model-settings.ts

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