use config proxy state for credential prechecks

plugins/services/credential_tester.go

@@ -112,6 +112,7 @@ type ConcurrentTestConfig struct {
 	RetryDelay              time.Duration // 重试延迟，默认 1s
 	MaxConsecutiveNetErrors int           // 连续网络错误阈值，超过则认为目标不可达，默认 5
 	TargetAddr              string        // 目标地址 host:port，用于 TCP 预检（可选）
+	UseProxy                bool          // 代理模式下跳过直连 TCP 预检
 }
 
 // DefaultConcurrentTestConfig 默认配置
@@ -125,6 +126,7 @@ func DefaultConcurrentTestConfig(config *common.Config) ConcurrentTestConfig {
 		MaxRetries:              3,
 		RetryDelay:              time.Second,
 		MaxConsecutiveNetErrors: 5,
+		UseProxy:                config.Network.Socks5Proxy != "" || config.Network.HTTPProxy != "",
 	}
 }
 
@@ -154,7 +156,7 @@ func TestCredentialsConcurrently(
 
 	// TCP 预检：快速验证目标可达，避免对不可达目标浪费全部凭据尝试
 	// 代理模式下跳过：net.DialTimeout 直连无法到达代理后的内网目标
-	if testConfig.TargetAddr != "" && !common.IsProxyEnabled() {
+	if testConfig.TargetAddr != "" && !testConfig.UseProxy {
 		preConn, err := net.DialTimeout("tcp", testConfig.TargetAddr, 3*time.Second)
 		if err != nil {
 			return &ScanResult{

plugins/services/credential_tester_test.go

@@ -268,6 +268,33 @@ func TestTestCredentialsConcurrently_EmptyCredentials(t *testing.T) {
 	}
 }
 
+func TestTestCredentialsConcurrently_ProxySkipsDirectPrecheck(t *testing.T) {
+	var calls atomic.Int32
+	authFn := func(ctx context.Context, cred Credential) *AuthResult {
+		calls.Add(1)
+		return &AuthResult{
+			Success: true,
+			Conn:    &mockConn{},
+		}
+	}
+
+	config := ConcurrentTestConfig{
+		Concurrency: 1,
+		MaxRetries:  1,
+		RetryDelay:  time.Millisecond,
+		TargetAddr:  "127.0.0.1:1",
+		UseProxy:    true,
+	}
+
+	result := TestCredentialsConcurrently(context.Background(), []Credential{{Username: "u", Password: "p"}}, authFn, "test", config)
+	if !result.Success {
+		t.Fatalf("proxy mode should skip direct precheck: %v", result.Error)
+	}
+	if calls.Load() == 0 {
+		t.Fatal("auth function was not called")
+	}
+}
+
 // TestTestCredentialsConcurrently_ContextCancel 测试context取消
 func TestTestCredentialsConcurrently_ContextCancel(t *testing.T) {
 	credentials := make([]Credential, 100)
@@ -451,4 +478,3 @@ func TestRetryLogic_AuthErrorNoRetry(t *testing.T) {
 
 // 确保 mockConn 实现 io.Closer 接口
 var _ io.Closer = (*mockConn)(nil)
-