fix(frontend): align Antigravity quota summaries

frontend/src/features/providers/utils/__tests__/antigravityQuotaSummary.spec.ts

@@ -16,7 +16,7 @@ describe('summarizeAntigravityQuotaItems', () => {
 
     expect(items.map(item => [item.label, item.remainingPercent, item.detail])).toEqual([
       ['Gemini额度', 90.6, '90.6%–95%'],
-      ['Claude额度', 82, '82%–100%'],
+      ['Claude & ChatGPT', 82, '82%–100%'],
     ])
     expect(items.map(item => item.resetSeconds)).toEqual([180, 120])
     expect(items[1]?.model).toBe('claude-sonnet-4-6')

frontend/src/features/providers/utils/antigravityQuota.ts

@@ -9,7 +9,7 @@ export interface AntigravityQuotaSortableItem {
 const ANTIGRAVITY_QUOTA_GROUPS = [
   { label: 'Gemini额度', matches: (model: string) => model.startsWith('gemini-') },
   {
-    label: 'Claude额度',
+    label: 'Claude & ChatGPT',
     matches: (model: string) => model.startsWith('claude-') || model.startsWith('gpt-'),
   },
 ] as const