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>

extension/tests/port_login_flow_server.cpp

@@ -655,6 +655,22 @@ bool FakeLoginServer::ServeGame(Connection& c, int index)
 			if (!ok)
 				return Fail(name + ": send GC_EXCHANGE");
 		}
+		// CInputMain::Chat (input_main.cpp): the line comes back to the speaker (PacketAround includes them)
+		// as a CHAT_TYPE_TALKING GC_CHAT "<name> : <text>" carrying their vid and empire.
+		if (header == HDR_CG_CHAT)
+		{
+			CGChatHead head;
+			std::memcpy(&head, packet, sizeof(head));
+			const size_t text_len = size > sizeof(head) ? size - sizeof(head) : 0;
+			const std::string text(reinterpret_cast<const char*>(packet + sizeof(head)),
+								   strnlen(reinterpret_cast<const char*>(packet + sizeof(head)), text_len));
+			Event(name + ":chat " + std::to_string(head.type) + " " + text);
+			const std::string line = std::string(kCharacterName) + " : " + text;
+			GCChatHead chat = {HDR_GC_CHAT, static_cast<std::uint16_t>(sizeof(GCChatHead) + line.size() + 1),
+							   0 /* CHAT_TYPE_TALKING */, kMainVID, 1};
+			if (!c.Send(chat) || !c.Send(line.c_str(), line.size() + 1))
+				return Fail(name + ": send GC_CHAT");
+		}
 		if (header == HDR_CG_MOVE)
 		{
 			CGMove move;