fix(outbound): test VLESS vnext endpoints (#6358)

Co-authored-by: sanmaxdev <sanmaxdev@users.noreply.github.com>

internal/web/service/outbound/outbound.go

@@ -257,7 +257,16 @@ func extractOutboundEndpoints(ob map[string]any) []string {
 			}
 		}
 	case "vless":
-		addServer(settings["address"], settings["port"])
+		if vnext, ok := settings["vnext"].([]any); ok {
+			for _, v := range vnext {
+				if vm, ok := v.(map[string]any); ok {
+					addServer(vm["address"], vm["port"])
+				}
+			}
+		}
+		if len(out) == 0 {
+			addServer(settings["address"], settings["port"])
+		}
 	case "hysteria":
 		addServer(settings["address"], settings["port"])
 	case "trojan", "shadowsocks", "http", "socks":

internal/web/service/outbound/outbound_endpoints_test.go

@@ -0,0 +1,54 @@
+package outbound
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestExtractOutboundEndpointsVLESS(t *testing.T) {
+	tests := []struct {
+		name     string
+		settings map[string]any
+		want     []string
+	}{
+		{
+			name: "vnext endpoints",
+			settings: map[string]any{
+				"vnext": []any{
+					map[string]any{"address": "first.example.com", "port": float64(443)},
+					map[string]any{"address": "second.example.com", "port": float64(8443)},
+				},
+			},
+			want: []string{"first.example.com:443", "second.example.com:8443"},
+		},
+		{
+			name: "flat endpoint",
+			settings: map[string]any{
+				"address": "legacy.example.com",
+				"port":    float64(443),
+			},
+			want: []string{"legacy.example.com:443"},
+		},
+		{
+			name: "invalid vnext falls back to flat endpoint",
+			settings: map[string]any{
+				"vnext":   []any{map[string]any{"address": "missing-port.example.com"}},
+				"address": "fallback.example.com",
+				"port":    float64(2053),
+			},
+			want: []string{"fallback.example.com:2053"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractOutboundEndpoints(map[string]any{
+				"protocol": "vless",
+				"settings": tt.settings,
+			})
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Fatalf("extractOutboundEndpoints() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}