2V1-b/c: PythonNetworkStream phases, AccountConnector and the net module

Port PythonNetworkStream with its HandShake/Login/Select/Loading/Offline
phases, AccountConnector and PythonNetworkStreamModule verbatim; the net
stub goes. PythonBoot creates the network stream, account connector,
player, flying manager and effect manager like CPythonApplication, and
app.Create/Process drive CNetworkDevice and both connectors.

Packet.h long fields become 32-bit LONG; port.packet checks 38
login/select/loading packet sizes against wire_classic.h. Unported units
in the link closure live under platform/pending/ as stand-ins. The macOS
gate now builds all and finds iconv.

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

extension/src/platform/pending/GameLib/FlyingObjectManager.cpp

@@ -0,0 +1,76 @@
+// Stand-in for the 40250 logic unit GameLib/FlyingObjectManager.cpp, not ported yet: the platform_stub.py skeleton of its
+// header, so the units that call it (批次 2V1, the network slice) link. Delete this file in the commit
+// that ports the unit into port/ (docs/PORT-PLAN.md 2V1).
+#include "GameLib/StdAfx.h"
+#include "GameLib/FlyingObjectManager.h"
+
+#include "../../PlatformStub.h"
+
+CFlyingManager::CFlyingManager()
+{
+	MT_PLATFORM_STUB();
+}
+
+CFlyingManager::~CFlyingManager()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::Destroy() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::DeleteAllInstances() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::RegisterFlyingData(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CFlyingManager::RegisterFlyingData(const char *, DWORD &) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CFlyingManager::CreateFlyingInstanceFlyTarget(const DWORD, const D3DXVECTOR3 &, const CFlyTarget &, bool) -> CFlyingInstance *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<CFlyingInstance *>();
+}
+
+auto CFlyingManager::Update() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::Render() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::RegisterIndexedFlyData(DWORD, BYTE, const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CFlyingManager::CreateIndexedFly(DWORD, CActorInstance *, CActorInstance *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::__DestroyFlyingInstanceList() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CFlyingManager::__DestroyFlyingDataMap() -> void
+{
+	MT_PLATFORM_STUB();
+}