Refactor models into sub-namespaces

Move many model classes into new sub-namespaces (ServiceLib.Models.CoreConfigs, ServiceLib.Models.Configs, ServiceLib.Models.Dto, ServiceLib.Models.Entities). Update GlobalUsings in ServiceLib, v2rayN.Desktop, v2rayN and add a tests GlobalUsings file to reference the new namespaces. Adjust static using directives in ClashApiManager and ClashProxiesViewModel to use ServiceLib.Models.Dto. This is a reorganization/rename of files and namespaces with no functional changes.

v2rayN/ServiceLib/Models/Entities/ProtocolExtraItem.cs

@@ -0,0 +1,45 @@
+namespace ServiceLib.Models.Entities;
+
+public record ProtocolExtraItem
+{
+    public bool? Uot { get; init; }
+    public string? CongestionControl { get; init; }
+
+    // vmess
+    public string? AlterId { get; init; }
+    public string? VmessSecurity { get; init; }
+
+    // vless
+    public string? Flow { get; init; }
+    public string? VlessEncryption { get; init; }
+    //public string? VisionSeed { get; init; }
+
+    // shadowsocks
+    //public string? PluginArgs { get; init; }
+    public string? SsMethod { get; init; }
+
+    // wireguard
+    public string? WgPublicKey { get; init; }
+    public string? WgPresharedKey { get; init; }
+    public string? WgInterfaceAddress { get; init; }
+    public string? WgReserved { get; init; }
+    public int? WgMtu { get; init; }
+
+    // hysteria2
+    public string? SalamanderPass { get; init; }
+    public int? UpMbps { get; init; }
+    public int? DownMbps { get; init; }
+    public string? Ports { get; init; }
+    public string? HopInterval { get; init; }
+
+    // naiveproxy
+    public int? InsecureConcurrency { get; init; }
+    public bool? NaiveQuic { get; init; }
+
+    // group profile
+    public string? GroupType { get; init; }
+    public string? ChildItems { get; init; }
+    public string? SubChildItems { get; init; }
+    public string? Filter { get; init; }
+    public EMultipleLoad? MultipleLoad { get; init; }
+}