Critical fix: For OpenGL, RenderDoc requires HGLRC (OpenGL context) as
the device pointer, not HDC. Previously OpenGL test incorrectly passed
HDC which caused capture to silently fail (NumCaptures=0).
Changes:
- OpenGLDevice: Add wglCreateContextAttribsARB support for debug context
- OpenGLDevice: Create OpenGL 4.6 core profile with debug flag
- RenderDocCapture: Pass correct window to SetActiveWindow/StartFrameCapture
- OpenGL test: Pass HGLRC via SetDevice(), use BeginCapture/EndCapture
Fix root cause identified via RenderDoc docs analysis:
'For OpenGL it must be the HGLRC, GLXContext, or EGLContext'
- OpenGLSwapChain::Initialize now uses AdjustWindowRect before SetWindowPos
- This ensures window client area matches expected size (1280x720)
- Previously SetWindowPos was given client area size instead of full window size
- Removed debug fprintf statements from OpenGLDevice
- Updated minimal integration test to use cleaner code
- Simplify OpenGL integration test structure
- Enable CTest registration for OpenGL tests
- Refactor test fixtures and device enumeration
- Minor code cleanup and improvements
- Relocated OpenGLDevice, OpenGLShader, OpenGLBuffer, OpenGLVertexArray, OpenGLTexture to engine/
- Updated engine/CMakeLists.txt to include OpenGL backend source files
- Updated tests/OpenGL/CMakeLists.txt to use engine backend
- Added OpenGLTexture class implementation
