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/src/platform/ScriptLib/PythonBoot.cpp

@@ -347,6 +347,7 @@ bool run_main_script_body(const char* lpCmdLine, std::string* error)
 	initchr();
 	initchrmgr();
 	initPlayer();
+	initNonPlayer();
 	initChat();
 	initnet();
 	initeffect();