2V0-g: port the .fnt font pipeline over a FreeType GDI emulation

CGraphicText, CGraphicFontTexture and CGraphicDib are the 40250 bodies
verbatim; CGraphicTextInstance is verbatim except that its D3D draws become
UI render commands (one image quad per glyph, Bar for cursor/underline).

- platform/Win32Gdi.cpp: the GDI subset those files call, over vendored
  FreeType 2.13.3, following GDI's LOGFONT cell height, win metrics and gasp
  rules; system font lookup with substitute and CJK fallback faces
- Win32Crt: MultiByteToWideChar / WideCharToMultiByte (UTF-8 and 1252 by
  hand, other code pages through iconv)
- CGraphicImageTexture memory textures: glyph pages reach Godot as
  "mem:<id>@<revision>"; Metin2PythonHost.memory_texture + Canvas cache
- Util.cpp code page / font face table, SetDefaultCodePage at boot,
  DefaultFont_* block, fnt resource type, GetMaxTextureWidth/Height
- TextTag, StringCodec, Arabic, Vietnamese copied from 40250
- tests: port.text (Tahoma 12 metrics, alignment, CP949), port.app_loop
  and python_host_test.gd now check glyph quads instead of text commands

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/platform/EterLib/GrpDevice.cpp

@@ -146,3 +146,17 @@ auto CGraphicDevice::CreateDoublePNTStreamVertexShader() -> DWORD
 	MT_PLATFORM_STUB();
 	return mt_platform_stub_return<DWORD>();
 }
+
+// 40250 GrpDevice.cpp:298-306; s_MaxTextureWidth/Height come from D3DCAPS8 in __CheckD3DCaps.
+// PORT: 4096 is the texture size every Godot renderer on the target GPUs supports.
+static DWORD s_MaxTextureWidth = 4096, s_MaxTextureHeight = 4096;
+
+DWORD GetMaxTextureWidth()
+{
+	return s_MaxTextureWidth;
+}
+
+DWORD GetMaxTextureHeight()
+{
+	return s_MaxTextureHeight;
+}