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

project/python_host_check.gd

@@ -55,8 +55,8 @@ func run() -> int:
 		print("system.py -> %s" % err)
 		_ck(err.contains(EXPECTED_STOP),
 				"system.py 进入 prototype.RunApp()，Create() 报告待实现的图形设备")
-		_ck(Metin2PythonHost.run_line("import player, item; assert player.__port_stub__ == 1 and item.__port_stub__ == 1") == "",
-				"2V0 玩法模块桩已注册，调用会记录到 stderr")
+		_ck(Metin2PythonHost.run_line("import player, item; assert not hasattr(player, '__port_stub__') and not hasattr(item, '__port_stub__')") == "",
+				"player 与 item 为 40250 原生移植模块")
 		_ck(Metin2PythonHost.run_line("import net; assert not hasattr(net, '__port_stub__') and net.PHASE_WINDOW_SELECT == 2 and not net.IsConnect()") == "",
 				"net 是移植的 40250 PythonNetworkStreamModule（2V1）")
 		# 真正从 Godot 入口转发事件给 40250 的 CWindowManager，再由窗口树回调 Python。