refactor: 重构项目结构和资源管理

- 将主程序代码和资源文件移动到Game目录下
- 更新构建脚本以适配新的目录结构
- 重构应用初始化流程，移除冗余代码
- 更新着色器文件路径和资源管理逻辑
- 删除废弃的windows.lua构建脚本
- 优化Switch平台构建配置

Game/assets/icons/README.md

@@ -0,0 +1,46 @@
+# Icon Setup Guide
+
+## Window Icon (运行时窗口图标)
+
+### Windows/Linux
+- Place `icon.bmp` (32x32 or larger) in `assets/icons/`
+- Set in code: `config.windowConfig.icon = Icon("assets/icons/icon.bmp");`
+
+### Switch
+- Place `icon.jpg` (256x256 JPEG) in `assets/icons/icon.jpg`
+- Automatically included in NRO build process
+
+## Application Icon (程序文件图标)
+
+### Windows (.exe 图标)
+需要创建 `.ico` 文件并放置在 `assets/icons/app.ico`
+
+#### 创建 .ico 文件的方法：
+
+**方法 1: 使用在线工具**
+1. 访问 https://icoconvert.com/
+2. 上传 PNG/JPG 图标（推荐 256x256）
+3.将下载的 .ico 文件保存到 `assets/icons/app.ico`
+
+**方法 2: 使用 GIMP**
+1. 打开图像
+2. 调整为 256x256
+3. 文件 → 导出为 → `app.ico`
+4. 保存到 `assets/icons/app.ico`
+
+**方法 3: 使用 ImageMagick**
+```bash
+convert icon.png -define icon:auto-resize=256,128,96,64,48,32,16 app.ico
+```
+
+#### Linux (.desktop 图标)
+- 将图标复制到 `/usr/share/icons/hicolor/256x256/apps/yourapp.png`
+- 创建 `.desktop` 文件指定 Icon 字段
+
+## Usage Example
+```cpp
+AppConfig config = AppConfig::createDefault();
+config.windowConfig.icon = Icon("assets/icons/icon.bmp");
+Application& app = Application::get();
+app.init(config);
+```

Game/shaders/colored_quad.frag

@@ -0,0 +1,9 @@
+#ifdef GL_ES
+  precision mediump float;
+#endif
+
+varying vec4 v_color;
+
+void main() {
+  gl_FragColor = v_color;
+}

Game/shaders/colored_quad.vert

@@ -0,0 +1,19 @@
+#ifdef GL_ES
+  precision mediump float;
+#endif
+
+attribute vec2 a_position;
+attribute vec2 a_texCoord;
+attribute vec4 a_color;
+
+uniform mat4 u_view;
+uniform mat4 u_projection;
+
+varying vec2 v_texCoord;
+varying vec4 v_color;
+
+void main() {
+  gl_Position = u_projection * u_view * vec4(a_position, 0.0, 1.0);
+  v_texCoord = a_texCoord;
+  v_color = a_color;
+}

Game/shaders/sprite.frag

@@ -0,0 +1,13 @@
+#ifdef GL_ES
+  precision mediump float;
+#endif
+
+varying vec2 v_texCoord;
+varying vec4 v_color;
+
+uniform sampler2D u_texture;
+
+void main() {
+  vec4 texColor = texture2D(u_texture, v_texCoord);
+  gl_FragColor = texColor * v_color;
+}

Game/shaders/sprite.vert

@@ -0,0 +1,20 @@
+#ifdef GL_ES
+  precision mediump float;
+#endif
+
+attribute vec2 a_position;
+attribute vec2 a_texCoord;
+attribute vec4 a_color;
+
+uniform mat4 u_view;
+uniform mat4 u_projection;
+uniform sampler2D u_texture;
+
+varying vec2 v_texCoord;
+varying vec4 v_color;
+
+void main() {
+  gl_Position = u_projection * u_view * vec4(a_position, 0.0, 1.0);
+  v_texCoord = a_texCoord;
+  v_color = a_color;
+}

Game/src/main.cpp

@@ -0,0 +1,34 @@
+#include "SDL_log.h"
+#include <SDL2/SDL.h>
+#include <frostbite2D/core/application.h>
+#include <frostbite2D/core/window.h>
+#include <frostbite2D/graphics/renderer.h>
+#include <frostbite2D/graphics/texture.h>
+#include <glad/glad.h>
+
+using namespace frostbite2D;
+
+int main(int argc, char **argv) {
+  AppConfig config = AppConfig::createDefault();
+  config.appName = "Frostbite2D Test App";
+  config.appVersion = "1.0.0";
+  config.windowConfig.width = 800;
+  config.windowConfig.height = 600;
+  config.windowConfig.title = "Frostbite2D - Renderer Test";
+
+  Application& app = Application::get();
+
+  if (!app.init(config)) {
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to initialize application!");
+    return -1;
+  }
+  
+  SDL_Log("Starting main loop...");
+
+  app.run();
+
+  app.shutdown();
+
+  SDL_Log("Application exited normally");
+  return 0;
+}