port 4-a: text input through CPythonIME (login typed, in-game chat)

- UserInterface/PythonIME(+Module) ported verbatim; ime module stubs removed, initime() after initdbg()
- EterLib/IME.cpp in platform/: 40250 buffer/WMChar bodies, IMM/TSF processors no-op; committed
  multi-byte text via PythonBoot::UIChar emulating GCS_RESULTSTR
- GameApplicationAdapter RunIME* -> CWindowManager; Godot keys -> ui_ime_key/ui_char
- port.login_flow/login_live type the account through the IME; chat CG_CHAT round-trip on the fake server
- python_game_render_test logs in with Godot key events

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

project/python_ui_surface.gd

@@ -20,6 +20,19 @@ const KEY_TO_DIK := {
 	KEY_RIGHT: 0xcd, KEY_DOWN: 0xd0,
 }
 
+# Win32 virtual-key codes of the keys EditLine.OnIMEKeyDown handles (WM_KEYDOWN → OnIMEKeyDown);
+# letters and digits use their ASCII code, as VK_A..VK_Z / VK_0..VK_9 do.
+const KEY_TO_VK := {
+	KEY_BACKSPACE: 0x08, KEY_TAB: 0x09, KEY_ENTER: 0x0d, KEY_KP_ENTER: 0x0d,
+	KEY_ESCAPE: 0x1b, KEY_SPACE: 0x20, KEY_END: 0x23, KEY_HOME: 0x24,
+	KEY_LEFT: 0x25, KEY_UP: 0x26, KEY_RIGHT: 0x27, KEY_DOWN: 0x28, KEY_DELETE: 0x2e,
+}
+
+# The control characters Windows turns these keys into (WM_CHAR); Godot reports them with unicode 0.
+const KEY_TO_CHAR := {
+	KEY_BACKSPACE: 0x08, KEY_TAB: 0x09, KEY_ENTER: 0x0d, KEY_KP_ENTER: 0x0d, KEY_ESCAPE: 0x1b,
+}
+
 # "mem:<id>" → [revision, ImageTexture]: the CGraphicFontTexture glyph pages, refetched when the
 # "@<revision>" of a command's name moves on (a glyph was added to the page).
 var _memory_textures := {}
@@ -98,6 +111,23 @@ func _unhandled_key_input(event: InputEvent) -> void:
 		var dik: int = KEY_TO_DIK.get(event.physical_keycode, 0)
 		if dik != 0:
 			Metin2PythonHost.ui_key(dik, event.pressed)
+		if event.pressed:
+			_ime_key(event)
+
+# 40250 gets every key press twice more through the window procedure: WM_KEYDOWN (a VK code, for
+# OnIMEKeyDown) and then WM_CHAR (the typed character, for CPythonIME). Held keys repeat both.
+func _ime_key(event: InputEventKey) -> void:
+	var keycode: int = event.keycode
+	var vk: int = KEY_TO_VK.get(keycode, 0)
+	if vk == 0 and ((keycode >= KEY_A and keycode <= KEY_Z) or (keycode >= KEY_0 and keycode <= KEY_9)):
+		vk = keycode
+	if vk != 0:
+		Metin2PythonHost.ui_ime_key(vk)
+	var ch: int = event.unicode
+	if ch == 0:
+		ch = KEY_TO_CHAR.get(keycode, 0)
+	if ch != 0:
+		Metin2PythonHost.ui_char(ch)
 
 # The command stream is drawn into pooled child canvas items in order: a run of plain commands
 # shares one item; a masked image (CPythonMiniMap's terrain tiles under minimap_image_filter.dds)