fix(logging): 修复GodotLogger生成器中的工厂实例化问题

- 修复GodotLoggerGenerator中GodotLoggerFactory的实例化方式，
  从静态方法调用改为实例方法调用
- 将默认日志字段名从"_log"更改为"Logger"，
  以提供更具描述性的命名

GFramework.Godot.SourceGenerators.Attributes/logging/GodotLogAttribute.cs

@@ -29,7 +29,7 @@ public sealed class GodotLogAttribute : Attribute
     public string? Name { get; set; }
 
     /// <summary>生成字段名</summary>
-    public string FieldName { get; set; } = "_log";
+    public string FieldName { get; set; } = "Logger";
 
     /// <summary>是否生成 static 字段</summary>
     public bool IsStatic { get; set; } = true;

GFramework.Godot.SourceGenerators/logging/GodotLoggerGenerator.cs

@@ -161,7 +161,7 @@ public sealed class GodotLoggerGenerator : IIncrementalGenerator
         sb.AppendLine("        /// <summary>Auto-generated logger</summary>");
         sb.AppendLine(
             $"        {access} {staticKeyword}readonly ILogger {fieldName} = " +
-            $"new GodotLoggerFactory.GetLogger(\"{name}\");");
+            $"new GodotLoggerFactory().GetLogger(\"{name}\");");
         sb.AppendLine("    }");
 
         if (ns is not null)

GFramework.SourceGenerators.Attributes/logging/LogAttribute.cs

@@ -26,7 +26,7 @@ public sealed class LogAttribute : Attribute
     public string? Name { get; set; }
 
     /// <summary>生成字段名</summary>
-    public string FieldName { get; set; } = "_log";
+    public string FieldName { get; set; } = "Logger";
 
     /// <summary>是否生成 static 字段</summary>
     public bool IsStatic { get; set; } = true;