2V0-f: run the real system.py app loop in Godot

- system.py runs app.Loop() on the script fiber; each UIUpdate is one
  CPythonApplication::Process(). Logo -> Login, popup ESC/click and
  app.Exit teardown (launcher cleared first, as in 40250 Main) work.
- Image commands are base-texture quads with UVs (a .sub shares its parent
  texture); ImageInstance/ExpandedImageInstance OnRender and SetRenderingRect
  ported verbatim, so scale/rotation/rendering rect are drawn.
- CGraphicBase::GetColor / grp.GenerateColor ported (ThinBoard background).
- port.app_loop test, python_host_test app-loop checks, MT_TEST_MODE=python_ui.
- TODO: .fnt/CGraphicText font pipeline, ExpandedImage blend modes.

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

extension/src/platform/ScriptLib/GameplayModules.cpp

@@ -2,6 +2,7 @@
 // These modules expose names for script loading; calls record that they still need the real 2V1-2V3 implementation.
 #include "ScriptLib/StdAfx.h"
 #include <cstdio>
+#include "../EterLib/UIRenderCommands.h"
 
 namespace {
 PyObject* stub_call_named(const char* name) {
@@ -1629,8 +1630,19 @@ PyMethodDef methods_snd[] = {
 const char* ints_snd[] = {NULL};
 const char* strings_snd[] = {NULL};
 // 40250 UserInterface/PythonSystemModule.cpp: systemSetting export names.
-PyObject* stub_systemSetting_GetWidth(PyObject*, PyObject*) { return stub_call_named("systemSetting.GetWidth"); }
-PyObject* stub_systemSetting_GetHeight(PyObject*, PyObject*) { return stub_call_named("systemSetting.GetHeight"); }
+// 40250 CPythonSystem::GetWidth/GetHeight return metin2.cfg's WIDTH/HEIGHT (default 800x600), which
+// RunApp passes to wndMgr.SetScreenSize and app.Create. PORT (2V0-f): the Godot canvas is the window,
+// so report its size; the rest of systemSetting stays a stub until CPythonSystem is ported.
+PyObject* stub_systemSetting_GetWidth(PyObject*, PyObject*) {
+    unsigned width = 0;
+    UIRenderGetSize(&width, nullptr);
+    return Py_BuildValue("i", width ? int(width) : 800);
+}
+PyObject* stub_systemSetting_GetHeight(PyObject*, PyObject*) {
+    unsigned height = 0;
+    UIRenderGetSize(nullptr, &height);
+    return Py_BuildValue("i", height ? int(height) : 600);
+}
 PyObject* stub_systemSetting_SetInterfaceHandler(PyObject*, PyObject*) { return stub_call_named("systemSetting.SetInterfaceHandler"); }
 PyObject* stub_systemSetting_DestroyInterfaceHandler(PyObject*, PyObject*) { return stub_call_named("systemSetting.DestroyInterfaceHandler"); }
 PyObject* stub_systemSetting_ReserveResource(PyObject*, PyObject*) { return stub_call_named("systemSetting.ReserveResource"); }