feat: major engine overhaul - scene demo with lighting, sphere, ground

- Scene Demo: cube + sphere + ground plane with proper lighting
- Audio: XAudio2 dynamic loading + WAV playback
- Physics: expanded collision system
- Renderer: improved pipeline with materials
- UI: extended widget system
- VisualScript: enhanced serializer + block interactions
- ASM: optimized math/memory/profiling routines
- Window: mouse input + scroll support

Engine/Rendering/renderer.h

@@ -4,10 +4,12 @@
 #include "mesh.h"
 #include "texture.h"
 #include "camera.h"
+#include "material.h"
 #include "../include/engine_api.h"
 #include "../ASM/math_c_fallback.h"
 
-typedef struct {
+typedef struct Renderer Renderer;
+struct Renderer {
     GraphicsDevice* device;
     Shader* current_shader;
     Mat4 view;
@@ -15,7 +17,7 @@ typedef struct {
     Vec3 light_dir;
     Vec4 light_color;
     Vec4 ambient_color;
-} Renderer;
+};
 
 Renderer* renderer_create(GraphicsDevice* device);
 void renderer_destroy(Renderer* renderer);
@@ -23,6 +25,7 @@ void renderer_begin_frame(Renderer* renderer);
 void renderer_end_frame(Renderer* renderer);
 void renderer_draw_mesh(Renderer* renderer, Mesh* mesh);
 void renderer_draw_mesh_with_shader(Renderer* renderer, Mesh* mesh, Shader* shader, const Mat4* world, Texture* tex);
+void renderer_draw_mesh_with_material(Renderer* renderer, Mesh* mesh, Material* material, const Mat4* world);
 void renderer_set_view(Renderer* renderer, const Mat4* view);
 void renderer_set_projection(Renderer* renderer, const Mat4* projection);
 void renderer_set_light(Renderer* renderer, Vec3 dir, Vec4 color, Vec4 ambient);