Unified logging: Replace LogSystem with EditorConsoleSink

- Created EditorConsoleSink (implements ILogSink interface)
- EditorConsoleSink stores logs in memory buffer (max 1000 entries)
- Added to Debug::Logger in Application::Initialize()
- ConsolePanel now reads from EditorConsoleSink via static GetInstance()
- Removed separate LogSystem singleton
- Removed editor/src/Core/LogEntry.h (no longer needed)

Now Editor and Engine share the same Debug::Logger, with ConsolePanel
displaying logs via EditorConsoleSink.

engine/src/RHI/D3D12/D3D12CommandList.cpp

@@ -30,6 +30,10 @@ bool D3D12CommandList::Initialize(ID3D12Device* device, CommandQueueType type, I
     m_commandAllocator = allocator;
     m_device = device;
 
+    char buf[512];
+    sprintf(buf, "[D3D12CommandList::Initialize] device=%p, allocator=%p, type=%d\n", device, allocator, (int)type);
+    OutputDebugStringA(buf);
+
     HRESULT hResult = device->CreateCommandList(
         0,
         listType,
@@ -39,6 +43,8 @@ bool D3D12CommandList::Initialize(ID3D12Device* device, CommandQueueType type, I
     );
 
     if (FAILED(hResult)) {
+        sprintf(buf, "[D3D12CommandList::Initialize] CreateCommandList failed: hr=0x%08X\n", hResult);
+        OutputDebugStringA(buf);
         return false;
     }