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

Add Xiaomi MiMo models to the opencode variant configuration so that
OpenCode users on Kilo Gateway can see and use MiMo Omni and MiMo Pro
with instant/thinking reasoning variants.

Closes #1641

Author: kilo-code-bot[bot]

src/lib/providers/model-settings.ts

@@ -5,6 +5,7 @@ import { isMoonshotModel } from '@/lib/providers/moonshotai';
 import { isOpenAiModel } from '@/lib/providers/openai';
 import { qwen35_plus_free_model } from '@/lib/providers/qwen';
 import { grok_code_fast_1_optimized_free_model } from '@/lib/providers/xai';
+import { isXiaomiModel } from '@/lib/providers/xiaomi';
 import { isZaiModel } from '@/lib/providers/zai';
 import type {
   CustomLlmProvider,
@@ -62,7 +63,7 @@ export function getModelVariants(model: string): OpenCodeSettings['variants'] {
       efforts.map(effort => [effort, { reasoning: { enabled: effort !== 'none', effort } }])
     );
   }
-  if (isMoonshotModel(model) || isZaiModel(model)) {
+  if (isMoonshotModel(model) || isZaiModel(model) || isXiaomiModel(model)) {
     return {
       instant: { reasoning: { enabled: false } },
       thinking: { reasoning: { enabled: true } },

src/tests/openrouter-models-sorting.approved.json

@@ -189,7 +189,20 @@
       "default_parameters": {},
       "preferredIndex": 3,
       "isFree": true,
-      "opencode": {}
+      "opencode": {
+        "variants": {
+          "instant": {
+            "reasoning": {
+              "enabled": false
+            }
+          },
+          "thinking": {
+            "reasoning": {
+              "enabled": true
+            }
+          }
+        }
+      }
     },
     {
       "id": "anthropic/claude-sonnet-4",
@@ -644,7 +657,20 @@
       ],
       "default_parameters": {},
       "isFree": true,
-      "opencode": {}
+      "opencode": {
+        "variants": {
+          "instant": {
+            "reasoning": {
+              "enabled": false
+            }
+          },
+          "thinking": {
+            "reasoning": {
+              "enabled": true
+            }
+          }
+        }
+      }
     },
     {
       "id": "x-ai/grok-code-fast-1:optimized:free",