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>

docs/PORT-PLAN.md

@@ -400,7 +400,8 @@ extension/third_party/cpython-2.7.18/                  # 静态库（2P 批次
    | 2V0-c | `wndMgr` / `grp` / `grpImage` / `grpText` / `grpThing` 模块 | 绑定已移植并通过导入/窗口句柄测试；图形绘制仍属 2V0-f |
    | 2V0-d | 42 个 `UserInterface` 头（都在 `PythonApplication.h` 后面）+ `PythonApplicationModule.cpp`（`app`） | 头与绑定已编译、链接并导入；应用生命周期 adapter 仍属 2V0-f |
    | 2V0-e | `dbg` 等桩模块补齐，`system.py` 跑到 `prototype.RunApp()` | 完成：27 个玩法 native 模块导出名桩记录每次调用；真实 `system.py` 已进入 `RunApp()`，目前由待实现的 `app.Create()` 报 `CREATE_DEVICE` |
-   | 2V0-f | Godot 渲染器上的 platform UI adapter；Logo/Popup 可显示可操作 | 完成：真实 `system.py` 在 app 进程内的脚本纤程上跑 `app.Loop()`（每个 `UIUpdate` = 一次 `CPythonApplication::Process()`），Logo→Login 切换、Popup ESC/点击、`app.Exit` 收尾（按 40250 Main 先 `pyLauncher.Clear()`）；图像统一为基贴图 + UV 的四边形命令（`.sub` 共用父贴图名），ExpandedImage 缩放/旋转/RenderingRect 原样移植；`grp.GenerateColor` 已移植（ThinBoard 半透明底）。`port.app_loop` + `python_host_test.gd` 覆盖输入/焦点/裁剪/文字/图像；`MT_TEST_MODE=python_ui` 可视运行。TODO：`.fnt`/`CGraphicText` 字体管线（现用 Godot 回退字体、无对齐）、ExpandedImage 混合模式（SCREEN/COLOR_DODGE/MODULATE）未应用。 |
+   | 2V0-f | Godot 渲染器上的 platform UI adapter；Logo/Popup 可显示可操作 | 完成：真实 `system.py` 在 app 进程内的脚本纤程上跑 `app.Loop()`（每个 `UIUpdate` = 一次 `CPythonApplication::Process()`），Logo→Login 切换、Popup ESC/点击、`app.Exit` 收尾（按 40250 Main 先 `pyLauncher.Clear()`）；图像统一为基贴图 + UV 的四边形命令（`.sub` 共用父贴图名），ExpandedImage 缩放/旋转/RenderingRect 原样移植；`grp.GenerateColor` 已移植（ThinBoard 半透明底）。`port.app_loop` + `python_host_test.gd` 覆盖输入/焦点/裁剪/文字/图像；`MT_TEST_MODE=python_ui` 可视运行。TODO：ExpandedImage 混合模式（SCREEN/COLOR_DODGE/MODULATE）未应用（字体管线见 2V0-g）。 |
+   | 2V0-g | `.fnt` 字体管线：`CGraphicText` / `CGraphicFontTexture` / `CGraphicDib` / `CGraphicTextInstance` | 完成：四个文件原样移植（`GrpTextInstance` 只把 D3D 绘制换成 UI 命令：每个字形一个四边形，光标/IME 下划线为 Bar）；GDI 子集（`CreateFontIndirect`/`CreateDIBSection`/`TextOutW`/`GetTextExtentPoint32W`/`GetCharABCWidthsFloatW`）在 `platform/Win32Gdi.cpp` 用 FreeType 按 GDI 规则模拟（LOGFONT 负高度=字符格高、win ascent/descent、gasp 决定单色/灰度、v35 解释器、斜体 oblique），字体按文件名在系统字体目录找，缺字体按 Arial/Roboto 等替换、缺字按 CJK 字体回退；字形页作为内存纹理（`mem:<id>@<rev>`）交给 Godot，Canvas 按 id 缓存、rev 变了才重取；`MultiByteToWideChar`/`WideCharToMultiByte`（UTF-8/1252 手写，其余代码页走 iconv）；`Util.cpp` 代码页→字体表、`SetDefaultCodePage` 在启动时按 40250 Main 调用；`DefaultFont_*` 原样；`fnt` 资源类型注册。`port.text`（Tahoma 12 行高 12、宽度/字符定位/居中、CP949 往返）+ `port.app_loop` + `python_host_test.gd` 验证。TODO：Android 的 `/system/fonts` 没有 Tahoma/Gulim，需要随包带字体（现走 Roboto/Noto 替换，度量与原版不同）；字形与 Windows GDI 的逐像素对比未做。 |
 2. **2V1 — 登录/选角**：加入 `PythonNetworkStream{,PhaseHandShake,PhaseLogin,PhaseSelect,PhaseLoading}.cpp`、
    `PythonNetworkStreamModule.cpp`、AccountConnector 及登录/选角脚本真实调用到的模块。验收为 FakeServer 离线完成 phase 顺序，
    再以真服 smoke 证明登录、角色列表和选择进入 Loading；未验证的服务器分支记 `NEEDS_LIVE`。

docs/THIRD-PARTY.md

@@ -8,7 +8,8 @@ build. Crypto++ joined later (2026-09-02) with the `MT_PROTOCOL=classic` 40250
 backend and was vendored the same way from the start.
 
 CPython joined on 2026-09-23 with 批次 2P (the embedded 40250 script layer) and is
-vendored source as well.
+vendored source as well. FreeType joined the same day with 批次 2V0-g (the 40250
+font path over an emulated GDI).
 
 Everything lives under `extension/third_party/` and is wired by
 `extension/third_party/CMakeLists.txt`, which exposes five aliases:
@@ -20,6 +21,7 @@ Everything lives under `extension/third_party/` and is wired by
 | `mt3p::minilzo`   | `minilzo`        | `mtproto`                          |
 | `mt3p::cryptopp`  | `cryptopp`       | `mtnet` (classic backend)          |
 | `mt3p::python`    | `mtpython`       | the script layer (`py_embed_test`) |
+| `mt3p::freetype`  | `freetype`       | `port_platform` (`platform/Win32Gdi.cpp`) |
 
 No source file changed: `#include <sodium.h>`, `#include <zstd.h>`,
 `#include <lzo/lzo1x.h>` and `#include <cryptopp/…>` all still resolve (the LZO
@@ -143,6 +145,23 @@ one via a 1-line shim header, see below).
   only obligation is keeping the license and a change notice, which this section
   and the patched files' comments serve.
 
+## FreeType 2.13.3 — vendored source, trimmed (not a submodule)
+
+* **Files:** `extension/third_party/freetype-2.13.3/` (~5 MB): the official
+  `freetype-2.13.3.tar.xz` (source URL and sha256 in the directory's
+  `CMakeLists.txt` header) cut down to `include/`, `src/{base,sfnt,truetype,smooth,raster,psnames,gzip}`,
+  `LICENSE.TXT` and `docs/FTL.TXT`.
+* **Build:** our own `CMakeLists.txt` (upstream's pulls in optional deps we don't
+  want); `mt-config/freetype/config/ftmodule.h` replaces the stock module list with
+  TrueType + sfnt + the mono and gray rasterizers. No upstream file is modified.
+* **Why:** 40250's `CGraphicFontTexture` / `CGraphicDib` render glyphs with GDI
+  (`CreateFontIndirect`, `TextOutW` into a DIB section). `platform/Win32Gdi.cpp`
+  implements that GDI subset over FreeType with GDI's cell-height, win-metric and
+  gasp rules, so the 40250 font code stays verbatim.
+* **License:** FreeType License (`docs/FTL.TXT`, BSD-style with credit clause):
+  the shipped product's documentation must credit "Portions of this software are
+  copyright © The FreeType Project (www.freetype.org)".
+
 ## Rebuilding / fetching
 
 `./build.sh` auto-runs `git submodule update --init --recursive` if any of the