refactor(proxy): remove is_proxy_target in favor of failover_queue

- Remove `is_proxy_target` field from Provider struct (Rust & TypeScript)
- Remove related DAO methods: get_proxy_target_provider, set_proxy_target
- Remove deprecated Tauri commands: get_proxy_targets, set_proxy_target
- Add `is_available()` method to CircuitBreaker for availability checks
  without consuming HalfOpen probe permits (used in select_providers)
- Keep `allow_request()` for actual request gating with permit tracking
- Update stream_check to use failover_queue instead of is_proxy_target
- Clean up commented-out reset circuit breaker button in ProviderActions
- Remove unused useProxyTargets and useSetProxyTarget hooks

src/components/providers/ProviderActions.tsx

@@ -7,7 +7,6 @@ import {
   Play,
   TestTube2,
   Trash2,
-  RotateCcw,
 } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import { Button } from "@/components/ui/button";
@@ -23,9 +22,6 @@ interface ProviderActionsProps {
   onTest?: () => void;
   onConfigureUsage: () => void;
   onDelete: () => void;
-  onResetCircuitBreaker?: () => void;
-  isProxyTarget?: boolean;
-  consecutiveFailures?: number;
 }
 
 export function ProviderActions({
@@ -38,9 +34,6 @@ export function ProviderActions({
   onTest,
   onConfigureUsage,
   onDelete,
-  onResetCircuitBreaker,
-  isProxyTarget,
-  consecutiveFailures = 0,
 }: ProviderActionsProps) {
   const { t } = useTranslation();
   const iconButtonClass = "h-8 w-8 p-1";
@@ -123,33 +116,6 @@ export function ProviderActions({
           <BarChart3 className="h-4 w-4" />
         </Button>
 
-        {/* 重置熔断器按钮 - 代理目标启用时显示 */}
-        {/* TODO: 暂时隐藏，后续根据故障转移功能启用 */}
-        {/* {onResetCircuitBreaker && isProxyTarget && (
-          <Button
-            size="icon"
-            variant="ghost"
-            onClick={onResetCircuitBreaker}
-            disabled={consecutiveFailures === 0}
-            title={
-              consecutiveFailures > 0
-                ? t("provider.resetCircuitBreaker", {
-                    defaultValue: "重置熔断器",
-                  })
-                : t("provider.noFailures", {
-                    defaultValue: "当前无失败记录",
-                  })
-            }
-            className={cn(
-              iconButtonClass,
-              consecutiveFailures > 0 &&
-                "hover:text-orange-500 dark:hover:text-orange-400",
-            )}
-          >
-            <RotateCcw className="h-4 w-4" />
-          </Button>
-        )} */}
-
         <Button
           size="icon"
           variant="ghost"

src/components/providers/ProviderCard.tsx

@@ -12,11 +12,7 @@ import { ProviderActions } from "@/components/providers/ProviderActions";
 import { ProviderIcon } from "@/components/ProviderIcon";
 import UsageFooter from "@/components/UsageFooter";
 import { ProviderHealthBadge } from "@/components/providers/ProviderHealthBadge";
-import {
-  useProviderHealth,
-  useResetCircuitBreaker,
-} from "@/lib/query/failover";
-import { toast } from "sonner";
+import { useProviderHealth } from "@/lib/query/failover";
 import { useUsageQuery } from "@/lib/query/queries";
 
 interface DragHandleProps {
@@ -98,32 +94,6 @@ export function ProviderCard({
   // 获取供应商健康状态
   const { data: health } = useProviderHealth(provider.id, appId);
 
-  // 重置熔断器
-  const resetCircuitBreaker = useResetCircuitBreaker();
-
-  const handleResetCircuitBreaker = async () => {
-    try {
-      await resetCircuitBreaker.mutateAsync({
-        providerId: provider.id,
-        appType: appId,
-      });
-      toast.success(
-        t("provider.circuitBreakerReset", {
-          defaultValue: "熔断器已重置",
-        }),
-        { closeButton: true },
-      );
-    } catch (error) {
-      toast.error(
-        t("provider.circuitBreakerResetFailed", {
-          defaultValue: "重置失败",
-        }) +
-          ": " +
-          String(error),
-      );
-    }
-  };
-
   const fallbackUrlText = t("provider.notConfigured", {
     defaultValue: "未配置接口地址",
   });
@@ -338,13 +308,6 @@ export function ProviderCard({
               onTest={onTest ? () => onTest(provider) : undefined}
               onConfigureUsage={() => onConfigureUsage(provider)}
               onDelete={() => onDelete(provider)}
-              onResetCircuitBreaker={
-                isProxyRunning && provider.isProxyTarget
-                  ? handleResetCircuitBreaker
-                  : undefined
-              }
-              isProxyTarget={provider.isProxyTarget}
-              consecutiveFailures={health?.consecutive_failures ?? 0}
             />
           </div>
         </div>