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/port/CMakeLists.txt

@@ -31,6 +31,10 @@ target_include_directories(port_logic PUBLIC ${MT_PORT_SHIMS})
 # Libraries 40250 links that are vendored as-is: <lzo/lzo1x.h> (EterBase/lzo.h), <cryptopp/*>
 # (EterBase/cipher.h), <Python-2.7/*> (ScriptLib).
 target_link_libraries(port_logic PUBLIC mt3p::minilzo mt3p::cryptopp)
+# common/Win32Crt.cpp converts non-UTF-8 code pages with iconv (MT_ICONV_LIBRARY, extension/CMakeLists.txt).
+if(MT_ICONV_LIBRARY)
+    target_link_libraries(port_logic PUBLIC ${MT_ICONV_LIBRARY})
+endif()
 if(TARGET mtpython)
     target_link_libraries(port_logic PUBLIC mt3p::python)
 endif()
@@ -164,6 +168,12 @@ if(BUILD_TESTING AND CMAKE_SYSTEM_NAME STREQUAL CMAKE_HOST_SYSTEM_NAME)
     add_test(NAME port.eterpack COMMAND $<TARGET_FILE:port_eterpack_test> ${MT_40250_CLIENT})
     set_tests_properties(port.eterpack PROPERTIES SKIP_RETURN_CODE 77)
 
+    # 批次 2V0-g: the 40250 font path over the FreeType GDI emulation; needs a system Tahoma.
+    add_executable(port_text_test ${CMAKE_CURRENT_SOURCE_DIR}/../../tests/port_text_test.cpp)
+    target_link_libraries(port_text_test PRIVATE port_platform)
+    add_test(NAME port.text COMMAND $<TARGET_FILE:port_text_test>)
+    set_tests_properties(port.text PROPERTIES SKIP_RETURN_CODE 77)
+
     if(TARGET mtpython)
         add_executable(port_python_launcher_test ${CMAKE_CURRENT_SOURCE_DIR}/../../tests/port_python_launcher_test.cpp)
         target_link_libraries(port_python_launcher_test PRIVATE port_platform)