add weapon skin & command for it

GameServer/Server/CallGS/Handlers/Girl/GirlWeaponSkin_Change.cs

@@ -0,0 +1,47 @@
+using MikuSB.Proto;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
+
+namespace MikuSB.GameServer.Server.CallGS.Handlers.Girl;
+
+[CallGSApi("GirlWeaponSkin_Change")]
+public class GirlWeaponSkin_Change : ICallGSHandler
+{
+    public async Task Handle(Connection connection, string param, ushort seqNo)
+    {
+        var req = JsonSerializer.Deserialize<GirlWeaponSkinParam>(param);
+        if (req == null)
+        {
+            await CallGSRouter.SendScript(connection, "GirlWeaponSkin_Change", "{}");
+            return;
+        }
+
+        var player = connection.Player!;
+        var cardData = player.CharacterManager.GetCharacterByGUID(req.CardId);
+        if (cardData == null) return;
+        var skinData = player.InventoryManager.GetNormalItem(req.SkinId);
+        if (skinData == null)
+        {
+            await CallGSRouter.SendScript(connection, "GirlWeaponSkin_Change", "{\"err\":\"error.BadParam\"}");
+            return;
+        }
+
+        cardData.WeaponSkinId = req.SkinId;
+        var sync = new NtfSyncPlayer
+        {
+            Items = { cardData.ToProto() }
+        };
+
+        await CallGSRouter.SendScript(connection, "GirlWeaponSkin_Change", "{}", sync);
+    }
+}
+
+internal sealed class GirlWeaponSkinParam
+{
+    [JsonPropertyName("nCardId")]
+    public uint CardId { get; set; }
+
+    [JsonPropertyName("nSkinId")]
+    public uint SkinId { get; set; }
+}