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/Window/window.c

@@ -8,7 +8,7 @@
 #include <string.h>
 
 // 窗口类名
-static const wchar_t* WINDOW_CLASS = L"MiMoEngineWindow";
+static const wchar_t* WINDOW_CLASS = L"Lity3DEngineWindow";
 
 // 全局回调
 static WindowKeyCallback g_key_callback = NULL;
@@ -58,22 +58,28 @@ static LRESULT CALLBACK window_proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM l
             return 0;
 
         case WM_LBUTTONDOWN:
+            SetCapture(hwnd);
             if (g_mouse_button_callback) g_mouse_button_callback(0, 1);
             return 0;
         case WM_RBUTTONDOWN:
+            SetCapture(hwnd);
             if (g_mouse_button_callback) g_mouse_button_callback(1, 1);
             return 0;
         case WM_MBUTTONDOWN:
+            SetCapture(hwnd);
             if (g_mouse_button_callback) g_mouse_button_callback(2, 1);
             return 0;
 
         case WM_LBUTTONUP:
+            if (GetCapture() == hwnd) ReleaseCapture();
             if (g_mouse_button_callback) g_mouse_button_callback(0, 0);
             return 0;
         case WM_RBUTTONUP:
+            if (GetCapture() == hwnd) ReleaseCapture();
             if (g_mouse_button_callback) g_mouse_button_callback(1, 0);
             return 0;
         case WM_MBUTTONUP:
+            if (GetCapture() == hwnd) ReleaseCapture();
             if (g_mouse_button_callback) g_mouse_button_callback(2, 0);
             return 0;