feat: 自定义数据源扩展 + 限频集中化 (v0.1.80)

frontend/src/lib/queryKeys.ts

@@ -14,6 +14,7 @@ export const QK = {
   endpoints:      ['endpoints'] as const,
   version:        ['version'] as const,
   preferences:    ['preferences'] as const,
+  dataSources:    ['data-sources'] as const,
   quoteStatus:    ['quote-status'] as const,
   quoteInterval:  ['quote-interval'] as const,
   overviewMarket: (asOf?: string) => ['overview-market', asOf ?? 'latest'] as const,