fix: 修复GDScript警告和UID冲突问题

代码修复:
- NetworkManager.gd: 修复参数名冲突和未使用变量警告
- StringUtils.gd: 修复变量名与内置函数char冲突
- ResponseHandler.gd: 移除static关键字，改为实例方法
- AuthScene.gd: 恢复正确的ResponseHandler调用方式

 资源清理:
- 删除assets/sprites/icon/下的重复图标文件
- 删除UI/Theme/下的重复字体和主题文件
- 统一使用assets/路径下的资源文件

 配置修复:
- 修复LoginWindow.tscn和main_scene.tscn中的UID引用
- 更新chinese_theme.tres中的字体路径引用
- 添加project.godot调试设置以减少渲染器警告

 文档更新:
- 更新项目设置指南中的主题和字体路径引用

解决问题:
-  修复所有GDScript编译警告
-  解决UID重复冲突警告
-  统一资源文件路径结构
-  保持Web部署兼容性

assets/sprites/icon/icon144.png.import

@@ -1,40 +0,0 @@
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assets/sprites/icon/icon16.png.import

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assets/sprites/icon/icon180.png.import

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assets/sprites/icon/icon32.png.import

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assets/sprites/icon/icon512.png.import

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assets/sprites/icon/icon64.png.import

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assets/sprites/icon/image(1).png.import

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assets/sprites/icon/image.png.import

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assets/ui/chinese_theme.tres

@@ -1,6 +1,6 @@
 [gd_resource type="Theme" load_steps=2 format=3 uid="uid://cp7t8tu7rmyad"]
 
-[ext_resource type="FontFile" uid="uid://ce7ujbeobblyr" path="res://UI/Theme/Fonts/msyh.ttc" id="1_ftb5w"]
+[ext_resource type="FontFile" uid="uid://ce7ujbeobblyr" path="res://assets/fonts/msyh.ttc" id="1_ftb5w"]
 
 [resource]
 resource_local_to_scene = true