test(serializer): 添加JSON序列化器单元测试并优化反序列化异常处理

- 添加了完整的JsonSerializer单元测试覆盖序列化和反序列化场景
- 优化了反序列化方法中的异常处理逻辑，改进错误信息
- 修改了DeserializeCore方法中未使用的参数命名
- 添加了对各种边界情况的测试验证，包括无效JSON和空值处理

GFramework.Game.Tests/Serializer/JsonSerializerTests.cs

@@ -82,6 +82,23 @@ public sealed class JsonSerializerTests
         });
     }
 
+    [Test]
+    public void Deserialize_With_Runtime_Type_Should_Throw_With_Target_Type_Context_When_Json_Is_Invalid()
+    {
+        var serializer = new GameJsonSerializer();
+
+        var exception =
+            Assert.Throws<InvalidOperationException>(() =>
+                serializer.Deserialize("{invalid json}", typeof(PlayerStateStub)));
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(exception, Is.Not.Null);
+            Assert.That(exception!.Message, Does.Contain(typeof(PlayerStateStub).FullName));
+            Assert.That(exception.InnerException, Is.Not.Null);
+        });
+    }
+
     [Test]
     public void Deserialize_With_Runtime_Type_Should_Return_Target_Runtime_Type()
     {

GFramework.Game/Serializer/JsonSerializer.cs

@@ -67,7 +67,7 @@ public sealed class JsonSerializer
         return (T)DeserializeCore(
             data,
             typeof(T),
-            static (json, type, settings) => JsonConvert.DeserializeObject<T>(json, settings));
+            static (json, _, settings) => JsonConvert.DeserializeObject<T>(json, settings));
     }
 
     /// <summary>
@@ -94,22 +94,25 @@ public sealed class JsonSerializer
         ArgumentNullException.ThrowIfNull(targetType);
         ArgumentNullException.ThrowIfNull(deserialize);
 
+        object? result;
+
         try
         {
-            var result = deserialize(data, targetType, _settings);
+            result = deserialize(data, targetType, _settings);
-            if (result == null)
-            {
-                throw new InvalidOperationException(
-                    $"Deserialization returned null for target type '{targetType.FullName}'.");
-            }
-
-            return result;
         }
-        catch (Exception ex) when (ex is InvalidCastException)
+        catch (Exception ex) when (ex is not ArgumentException)
         {
             throw new InvalidOperationException(
                 $"Failed to deserialize JSON to target type '{targetType.FullName}'.",
                 ex);
         }
+
+        if (result == null)
+        {
+            throw new InvalidOperationException(
+                $"Deserialization returned null for target type '{targetType.FullName}'.");
+        }
+
+        return result;
     }
 }