新增私聊相关

Hotfix/Social/Chat/Handler/Inner/G2S_ExitRequestHandler.cs

@@ -0,0 +1,16 @@
+using Fantasy;
+using Fantasy.Async;
+using Fantasy.Network.Interface;
+
+namespace NB.Chat;
+
+public class G2S_ExitRequestHandler : RouteRPC<Scene, G2S_ExitRequest, S2G_ExitResponse>
+{
+    protected override async FTask Run(Scene scene, G2S_ExitRequest request, S2G_ExitResponse response,
+        Action reply)
+    {
+        // 在缓存中检查该账号是否存在
+        var chatUnitManageComponent = scene.GetComponent<SocialUnitManageComponent>();
+        await chatUnitManageComponent.Offline(scene, request.AccountId, request.GateRouteId);
+    }
+}