feat(渲染器): 添加基础2D渲染系统

实现核心渲染功能，包括着色器管理、批处理系统、相机控制和纹理加载

- 添加着色器管理器用于加载和管理GLSL着色器程序
- 实现批处理系统优化绘制调用
- 添加相机控制支持视图和投影矩阵
- 实现纹理加载和管理功能
- 添加基础2D渲染API包括绘制四边形和精灵
- 集成到应用系统中，支持自动初始化和清理
- 添加示例着色器用于彩色四边形和纹理精灵
- 更新构建系统包含新的渲染相关文件

Frostbite2D/include/frostbite2D/graphics/renderer.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <frostbite2D/graphics/types.h>
+#include <frostbite2D/graphics/texture.h>
+#include <frostbite2D/graphics/shader.h>
+#include <frostbite2D/graphics/shader_manager.h>
+#include <frostbite2D/graphics/batch.h>
+#include <frostbite2D/graphics/camera.h>
+#include <string>
+
+namespace frostbite2D {
+
+class Renderer {
+public:
+  static Renderer& get();
+  
+  bool init();
+  void shutdown();
+  
+  void beginFrame();
+  void endFrame();
+  void flush();
+  
+  void setViewport(int x, int y, int width, int height);
+  void setClearColor(float r, float g, float b, float a = 1.0f);
+  void setClearColor(const Color& color);
+  void clear(uint32_t flags);
+  
+  void setCamera(Camera* camera);
+  Camera* getCamera() { return camera_; }
+  
+  void drawQuad(const Vec2& pos, const Size& size, float cr = 1.0f, float cg = 1.0f,
+                float cb = 1.0f, float ca = 1.0f);
+  void drawQuad(const Vec2& pos, const Size& size, Ptr<Texture> texture);
+  void drawQuad(const Rect& rect, const Color& color);
+  
+  void drawSprite(const Vec2& pos, const Size& size, Ptr<Texture> texture);
+  void drawSprite(const Vec2& pos, const Rect& srcRect, const Vec2& texSize, 
+                  Ptr<Texture> texture, const Color& color = Color(1, 1, 1, 1));
+  
+  ShaderManager& getShaderManager() { return shaderManager_; }
+  Batch& getBatch() { return batch_; }
+  
+private:
+  Renderer();
+  ~Renderer();
+  
+  void setupBlendMode(BlendMode mode);
+  void updateUniforms();
+  
+  ShaderManager shaderManager_;
+  Batch batch_;
+  Camera* camera_ = nullptr;
+  
+  uint32_t clearColor_[4] = {0, 0, 0, 255};
+  int viewportX_ = 0;
+  int viewportY_ = 0;
+  int viewportWidth_ = 1280;
+  int viewportHeight_ = 720;
+  
+  bool initialized_ = false;
+  
+  Renderer(const Renderer&) = delete;
+  Renderer& operator=(const Renderer&) = delete;
+};
+
+}