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

Demo/main.c

@@ -163,7 +163,7 @@ int main(int argc, char* argv[]) {
     (void)argc; (void)argv;
 
     EngineConfig config = engine_default_config();
-    config.app_name = "MiMo Engine - Scene Demo";
+    config.app_name = "Lity3D - Scene Demo";
     config.vsync = 0;
     config.window_width = 1280;
     config.window_height = 720;