fix(gateway): expose MiMo model variants to OpenCode clients

[kilo-code-bot]

Summary

• Xiaomi MiMo models (xiaomi/mimo-v2-pro:free and xiaomi/mimo-v2-omni:free) were missing opencode.variants configuration, causing OpenCode clients on Kilo Gateway to not properly recognize or surface these reasoning models.
• Added isXiaomiModel to the variant detection in getModelVariants() so MiMo models now expose instant (reasoning disabled) and thinking (reasoning enabled) variants, matching the pattern used by other reasoning models like Moonshot and ZAI.
• Updated the approved test snapshot to reflect the new opencode variant settings for both MiMo models.

Closes #1641

Verification

• pnpm typecheck — passed, no errors
• Manual review of getOpenCodeSettings() flow confirms MiMo models now return { variants: { instant: ..., thinking: ... } } instead of {}

Visual Changes

N/A

Reviewer Notes

• The fix adds isXiaomiModel(model) to the existing isMoonshotModel(model) || isZaiModel(model) branch in getModelVariants() (src/lib/providers/model-settings.ts:66), giving MiMo models the same instant/thinking variant structure as other reasoning-capable models.
• Both MiMo models were already registered in kiloFreeModels with status: 'public' and the 'reasoning' flag — the only missing piece was the opencode variant configuration that tells clients how to toggle reasoning.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• src/lib/providers/model-settings.ts
• src/tests/openrouter-models-sorting.approved.json

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_{Reviewed by gpt-5.4-20260305 · 123,652 tokens}