refactor(ai-gateway): derive model variants from catalog

[chrarnoldus]

Summary

• Derive OpenRouter model reasoning variants from the persisted model catalog when supported efforts are available.
• Preserve the existing model-name fallback rules for direct BYOK, models.dev synchronization, code-review variant lists, and catalog misses.
• Make catalog-aware OpenCode settings asynchronous and apply the resolved variants to OpenRouter model metadata and auto-routing decisions.

Verification

• No manual UI verification required; this is server-side model metadata and routing behavior.

Visual Changes

N/A

Reviewer Notes

• Review the mandatory versus optional reasoning handling, including the synthesized none variant and Anthropic verbosity mapping.
• The fallback model-name variants are intentionally kept separate from catalog-derived variants so direct BYOK and code-review consumers remain synchronous.

[kilo-code-bot]

Code Review Summary

Status: 2 Issues Found | Recommendation: Address before merge

Executive Summary

The catalog-derived variant refactor drops a still-required OpenRouterReasoningConfig cast in auto-model resolution and breaks the existing resolution.test.ts suite via an incomplete gateway-models-cache jest mock.

Overview

Severity	Count
CRITICAL	2
WARNING	0
SUGGESTION	0

Issue Details (click to expand)

CRITICAL

File	Line	Issue
apps/web/src/lib/ai-gateway/auto-model/resolution.ts	253	Removed as OpenRouterReasoningConfig cast; catalog ReasoningEffort ('max') still exceeds ChatCompletionReasoningEffort at the same pinned openai@6.49.0, so typecheck fails
apps/web/src/lib/ai-gateway/providers/model-settings.ts	15	New getOpenRouterModelsMetadataFromDatabase import is undefined under resolution.test.ts's partial gateway-models-cache mock — all variant-branch tests fail with TypeError

Files Reviewed (10 files)

• apps/web/src/lib/ai-gateway/auto-model/resolution.ts - 1 issue
• apps/web/src/lib/ai-gateway/providers/direct-byok/byteplus-coding.ts - 0 issues
• apps/web/src/lib/ai-gateway/providers/direct-byok/index.test.ts - 0 issues
• apps/web/src/lib/ai-gateway/providers/direct-byok/index.ts - 0 issues
• apps/web/src/lib/ai-gateway/providers/direct-byok/sync-direct-byok.ts - 0 issues
• apps/web/src/lib/ai-gateway/providers/model-settings.ts - 1 issue
• apps/web/src/lib/ai-gateway/providers/openrouter/index.ts - 0 issues
• apps/web/src/lib/ai-gateway/providers/openrouter/types.ts - 0 issues
• apps/web/src/lib/ai-gateway/providers/variants.ts - 0 issues
• apps/web/src/lib/code-reviews/core/model-variants.ts - 0 issues

Fix these issues in Kilo Cloud

---

_{Reviewed by kimi-k3 · Input: 136.5K · Output: 40.8K · Cached: 3.5M}

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