perf: 节点内核类型

pb/constant/vpncore.go

@@ -3,6 +3,8 @@ package constant
 type VpnCore string
 
 const (
-	VpnCoreXray    VpnCore = "Xray"
-	VpnCoreSingBox VpnCore = "SingBox"
+	VpnCoreDefault VpnCore = "Default" // 默认内核（st内核）
+	VpnCoreNone    VpnCore = "None"    // 无内核
+	VpnCoreXray    VpnCore = "Xray"    // Xray 内核
+	VpnCoreSingBox VpnCore = "SingBox" // SingBox 内核
 )