Move from the hand.

Shogi.UI/Program.cs

@@ -63,8 +63,6 @@ static void ConfigureDependencies(IServiceCollection services, IConfiguration co
 
     var serializerOptions = new JsonSerializerOptions
     {
-        DictionaryKeyPolicy = JsonNamingPolicy.CamelCase,
-        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
         WriteIndented = true
     };
     services.AddScoped((sp) => serializerOptions);