port: ServerStateChecker + module (batch 2 P2)

Verbatim 40250 CServerStateChecker and the ServerStateChecker Python
module replace the stub; PythonBoot owns the instance like
CPythonApplication::m_kServerStateChecker. The fake server gets a state
port that answers CG_STATE_CHECKER the way CInputHandshake and
CInputDB::RespondChannelStatus do; login_flow requests the channel list
after the character list (live: {1: 1, 2: 1}).

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

extension/src/platform/ScriptLib/GameplayModuleConstants.cpp

@@ -2,7 +2,6 @@
 // The module constants of the 2V0 stub modules (GameplayModules.cpp), copied from each 40250
 // module's init function with the preprocessor lines around them.
 #include "UserInterface/StdAfx.h"
-#include "UserInterface/ServerStateChecker.h"
 #include "UserInterface/PythonSystem.h"
 #include "UserInterface/PythonBackground.h"
 #include "EterLib/StateManager.h"
@@ -36,12 +35,6 @@
 #include "UserInterface/PythonPlayer.h"
 #include "UserInterface/PythonTextTail.h"
 
-// 40250 UserInterface/ServerStateCheckerModule.cpp
-void AddStubConstants_ServerStateChecker(PyObject* poModule)
-{
-	(void) poModule;
-}
-
 // 40250 UserInterface/PythonBackgroundModule.cpp
 void AddStubConstants_background(PyObject* poModule)
 {