refactor(ai-gateway): extract model variant lists into constants (#3595)

Pull the inline Claude, Opus, Seed, and Mercury reasoning variant objects out of getModelVariants into named constants and reuse shared definitions via spread to reduce duplication.

Co-authored-by: kiloconnect[bot] <240665456+kiloconnect[bot]@users.noreply.github.com>

Author: kilo-code-bot[bot]

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

@@ -35,25 +35,40 @@ export const REASONING_VARIANTS_NONE_LOW_MEDIUM_HIGH = {
   ...REASONING_VARIANTS_LOW_MEDIUM_HIGH,
 } as const;
 
+const REASONING_VARIANTS_CLAUDE_BASE = {
+  none: { reasoning: { enabled: false, effort: 'none' } },
+  low: { reasoning: { enabled: true, effort: 'low' }, verbosity: 'low' },
+  medium: { reasoning: { enabled: true, effort: 'medium' }, verbosity: 'medium' },
+  high: { reasoning: { enabled: true, effort: 'high' }, verbosity: 'high' },
+} as const;
+
+export const REASONING_VARIANTS_CLAUDE = {
+  ...REASONING_VARIANTS_CLAUDE_BASE,
+  max: { reasoning: { enabled: true, effort: 'xhigh' }, verbosity: 'max' },
+} as const;
+
+export const REASONING_VARIANTS_OPUS = {
+  ...REASONING_VARIANTS_CLAUDE_BASE,
+  xhigh: { reasoning: { enabled: true, effort: 'xhigh' }, verbosity: 'xhigh' },
+  max: { reasoning: { enabled: true, effort: 'xhigh' }, verbosity: 'max' },
+} as const;
+
+export const REASONING_VARIANTS_SEED = {
+  none: { reasoning: { enabled: false, effort: 'minimal' } },
+  ...REASONING_VARIANTS_LOW_MEDIUM_HIGH,
+} as const;
+
+export const REASONING_VARIANTS_INSTANT_LOW_MEDIUM_HIGH = {
+  instant: REASONING_VARIANTS_BINARY.instant,
+  ...REASONING_VARIANTS_LOW_MEDIUM_HIGH,
+} as const;
+
 export function getModelVariants(model: string): OpenCodeSettings['variants'] {
   if (isOpusModel(model) && (model.includes('4.7') || model.includes('4.8'))) {
-    return {
-      none: { reasoning: { enabled: false, effort: 'none' } },
-      low: { reasoning: { enabled: true, effort: 'low' }, verbosity: 'low' },
-      medium: { reasoning: { enabled: true, effort: 'medium' }, verbosity: 'medium' },
-      high: { reasoning: { enabled: true, effort: 'high' }, verbosity: 'high' },
-      xhigh: { reasoning: { enabled: true, effort: 'xhigh' }, verbosity: 'xhigh' },
-      max: { reasoning: { enabled: true, effort: 'xhigh' }, verbosity: 'max' },
-    };
+    return REASONING_VARIANTS_OPUS;
   }
   if (isClaudeModel(model)) {
-    return {
-      none: { reasoning: { enabled: false, effort: 'none' } },
-      low: { reasoning: { enabled: true, effort: 'low' }, verbosity: 'low' },
-      medium: { reasoning: { enabled: true, effort: 'medium' }, verbosity: 'medium' },
-      high: { reasoning: { enabled: true, effort: 'high' }, verbosity: 'high' },
-      max: { reasoning: { enabled: true, effort: 'xhigh' }, verbosity: 'max' },
-    };
+    return REASONING_VARIANTS_CLAUDE;
   }
   if (model.includes('codex') || isGemini3Model(model)) {
     return Object.fromEntries(
@@ -80,20 +95,10 @@ export function getModelVariants(model: string): OpenCodeSettings['variants'] {
     return REASONING_VARIANTS_BINARY;
   }
   if (model === seed_20_code_free_model.public_id) {
-    return {
-      none: { reasoning: { enabled: false, effort: 'minimal' } },
-      low: { reasoning: { enabled: true, effort: 'low' } },
-      medium: { reasoning: { enabled: true, effort: 'medium' } },
-      high: { reasoning: { enabled: true, effort: 'high' } },
-    };
+    return REASONING_VARIANTS_SEED;
   }
   if (model.startsWith('inception/mercury-2')) {
-    return {
-      instant: { reasoning: { enabled: false, effort: 'none' } },
-      low: { reasoning: { enabled: true, effort: 'low' } },
-      medium: { reasoning: { enabled: true, effort: 'medium' } },
-      high: { reasoning: { enabled: true, effort: 'high' } },
-    };
+    return REASONING_VARIANTS_INSTANT_LOW_MEDIUM_HIGH;
   }
   if (isStepModel(model)) {
     return REASONING_VARIANTS_LOW_MEDIUM_HIGH;