port: ItemData, ItemManager, PythonNonPlayer + LoadLocaleData (batch 2 P3-a)

Verbatim 40250 GameLib ItemData/ItemManager and UserInterface
PythonNonPlayer(+Module) replace their pending stand-ins and the
nonplayer module stub. LoadLocaleData's body moves into the platform
CPythonApplication stand-in, so the select phase loads item_proto and
mob_proto; CPythonSkill is still pending, so it returns false after the
tables load. login_flow checks item 19 (Sword+9) and mob 101 (Wild Dog),
offline and live.

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

extension/tests/port_login_flow_test.cpp

@@ -47,6 +47,7 @@
 #include "GameLib/RaceMotionData.h"
 #include "GameLib/FlyingData.h"
 #include "GameLib/FlyingObjectManager.h"
+#include "GameLib/ItemManager.h"
 #include "UserInterface/StdAfx.h"
 #include "UserInterface/PythonCharacterManager.h"
 #include "UserInterface/InstanceBase.h"
@@ -297,6 +298,23 @@ int main(int argc, char** argv)
 			CHECK(server->Has("state:checker"));
 	}
 
+	// 3c. SetSelectCharacterPhase ran localeInfo.LoadLocaleData() → app.LoadLocaleData(app.GetLocalePath()):
+	//     CItemManager read item_list.txt/item_proto/itemdesc.txt and CPythonNonPlayer read mob_proto.
+	{
+		CItemData* sword = nullptr;
+		CHECK(CItemManager::Instance().GetItemDataPointer(19, &sword) && sword);
+		if (sword)
+		{
+			std::printf("port_login_flow_test: item 19 %s type %u refine %u\n", sword->GetName(), sword->GetType(), sword->GetRefine());
+			CHECK(sword->GetType() == CItemData::ITEM_TYPE_WEAPON && sword->GetRefine() == 9);
+			CHECK(sword->GetModelThing() != nullptr);
+		}
+		CHECK(py("import nonplayer\n"
+		         "_mob = nonplayer.GetMonsterName(101)\n"
+		         "assert _mob, 'mob 101 has no name'\n"
+		         "import sys\nsys.stderr.write('port_login_flow_test: mob 101 %s\\n' % _mob)"));
+	}
+
 	// 4-5. Start the game on the slot: DirectEnter, the second game login and the loading phase.
 	if (selecting)
 	{