fix(failover): improve cache cleanup for provider health and circuit breaker

- Use removeQueries instead of invalidateQueries when stopping proxy to
  completely clear health and circuit breaker caches
- Clear provider health and circuit breaker caches when removing from
  failover queue
- Refresh failover queue after drag-sort since queue order depends on
  sort_index
- Only show health badge when provider is in failover queue

src/hooks/useDragSort.ts

@@ -75,6 +75,11 @@ export function useDragSort(providers: Record<string, Provider>, appId: AppId) {
           queryKey: ["providers", appId],
         });
 
+        // 刷新故障转移队列（因为队列顺序依赖 sort_index）
+        await queryClient.invalidateQueries({
+          queryKey: ["failoverQueue", appId],
+        });
+
         // 更新托盘菜单以反映新的排序（失败不影响主操作）
         try {
           await providersApi.updateTrayMenu();

src/hooks/useProxyStatus.ts

@@ -73,8 +73,10 @@ export function useProxyStatus() {
       );
       queryClient.invalidateQueries({ queryKey: ["proxyStatus"] });
       queryClient.invalidateQueries({ queryKey: ["proxyTakeoverStatus"] });
-      // 清除所有供应商健康状态缓存（后端已清空数据库记录）
-      queryClient.invalidateQueries({ queryKey: ["providerHealth"] });
+      // 彻底删除所有供应商健康状态缓存（后端已清空数据库记录）
+      queryClient.removeQueries({ queryKey: ["providerHealth"] });
+      // 彻底删除所有熔断器统计缓存（代理停止后熔断器状态已重置）
+      queryClient.removeQueries({ queryKey: ["circuitBreakerStats"] });
       // 注意：故障转移队列和开关状态会保留，不需要刷新
     },
     onError: (error: Error) => {