sync: user's Lity3D_source.zip changes

- Engine core: improved initialization and lifecycle
- Renderer: camera and rendering pipeline updates
- Editor: updated editor code
- Window: improved window handling
- Demo/main.c: scene demo with AssetManager + scene loading
- build.bat: updated build script
- 11 files modified from user's manual edits

Engine/Core/engine.h

@@ -37,7 +37,7 @@ typedef struct {
 // 初始化默认配置
 static inline EngineConfig engine_default_config(void) {
     EngineConfig config;
-    config.app_name = "MiMo Engine ASM";
+    config.app_name = "Lity3D Engine";
     config.window_width = 1280;
     config.window_height = 720;
     config.fullscreen = 0;