feat(ai-gateway): store model reasoning metadata

[chrarnoldus]

Summary

• preserve OpenRouter model reasoning metadata during gateway model sync
• store only mandatory and optional supported_efforts, stripping unsupported response fields
• cover models with and without supported effort lists

Validation

• scripts/typecheck-all.sh --changes-only
• pnpm --filter @kilocode/db lint
• pnpm exec oxfmt --check packages/db/src/schema-types.ts packages/db/src/schema-types.test.ts
• direct TypeScript parsing assertion against representative OpenRouter model data

Testing note

• focused Jest execution was blocked because the web Jest config does not discover external packages/db tests from the Agent Manager worktree path