port: purge obsolete GDScript UI, legacy flows, and deprecated controllers

- Purged 66 obsolete GDScript UI components and mobile prototype UI from project/ui/ (retaining ui_assets.gd)
- Purged deprecated GDScript game scene, flow state machines, and local gameplay controllers (app_flow, game_scene, player_controller, net_world, etc.)
- Purged deprecated local system simulation scripts (consumable_system, chest_system, equip_rules, etc.) and project/fx/
- Purged legacy GDScript unit tests targeting obsolete classes
- Unified viewport back buffer sizing in CGraphicBase/CGraphicDevice/PythonBoot
- Cleaned up client_main.gd and python_host_check.gd for pure native port architecture
- Verified all port tests passing: port_map.py check (0 errors), port_gate.sh macos PASS (19/19 suites), python_game_render_test PASS

extension/src/platform/ScriptLib/PythonBoot.cpp

@@ -7,6 +7,7 @@
 #include "EterPythonLib/StdAfx.h"
 #include "EterBase/Timer.h"
 #include "EterLib/Util.h"
+#include "EterLib/GrpBase.h"
 #include "../EterLib/HostCursor.h"
 #include "UserInterface/PythonNetworkStream.h"
 #include "UserInterface/AccountConnector.h"
@@ -239,6 +240,7 @@ void SetUISize(int width, int height)
 	g_window_manager->SetScreenSize(width, height);
 	g_window_manager->SetResolution(width, height);
 	UIRenderSetSize(width, height);
+	CGraphicBase::SetBackBufferSize(width, height);
 	if (g_game_singletons)
 	{
 		g_game_singletons->pySystem.GetConfig()->width = width;