port(2P step 3a/3b): stdlib on sys.path + the pack module

step 3a — 标准库:
  tools/py_embed/make_stdlib_zip.py packs the vendored Lib/ into
  <build>/python27.zip (397 modules, 6876547 bytes, ZIP_STORED — the zlib
  module is trimmed out of our CPython, so zipimport cannot inflate).
  The mtpython_stdlib target builds it; py_embed_test and the launcher test
  both run against it.
  platform/ScriptLib/PythonHost sets the embedding flags before
  Py_Initialize and, after it, puts the zip on sys.path and re-registers
  encodings.search_function with codecs — 2.7 builds the codec registry
  once, at startup, so replacing sys.path afterwards needs it back.

step 3b — pack 模块:
  UserInterface/PythonPackModule.cpp copied verbatim; packExist/packGet/
  initpack read root/ and uiscript/ through CEterPackManager, i.e. through
  asset_io. The CHINA_CRYPT_KEY block in that unit is CAccountConnector's
  and is kept #if 0 until the login slice (2V1). UserInterface/StdAfx.h is
  a documented partial mirror — the original is the whole client's PCH.

The launcher test now runs initpack() as RunMainScript does (its first
line), reads system.py / uiscript / locale text back out of the packs, and
confirms cp1252 decoding works off the zip. system.py still stops at
"No module named app" — the C++ modules are the 2V0 slice.

gates: port_map.py check 0 errors · key leak check 8/8 none · macOS ctest
27/27 · android + ios port_platform compile clean.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

extension/src/port/UserInterface/PythonPackModule.cpp

@@ -0,0 +1,92 @@
+#include "StdAfx.h"
+#include "../EterPack/EterPackManager.h"
+#include "../EterBase/tea.h"
+
+// CHINA_CRYPT_KEY
+DWORD g_adwEncryptKey[4];
+DWORD g_adwDecryptKey[4];
+
+// PORT: the login cipher's key builder happens to live in this unit, but it is CAccountConnector's —
+// AccountConnector.h and the class come with the login slice (docs/PORT-PLAN.md 批次 2V1). Kept verbatim
+// and compiled out until then; the two keys above stay, they are what the network stream reads.
+#if 0
+#include "AccountConnector.h"
+
+inline const BYTE* GetKey_20050304Myevan()
+{
+	volatile static DWORD s_adwKey[1938];
+
+	volatile DWORD seed=1491971513;
+	for (UINT i=0; i<BYTE(seed); i++)
+	{
+		seed^=2148941891;
+		seed+=3592385981;
+		s_adwKey[i]=seed;
+	}
+
+	return (const BYTE*)s_adwKey;
+}
+
+//#include <eterCrypt.h>
+
+void CAccountConnector::__BuildClientKey_20050304Myevan()
+{
+	const BYTE * c_pszKey = GetKey_20050304Myevan();
+	memcpy(g_adwEncryptKey, c_pszKey+157, 16);
+
+	for (DWORD i = 0; i < 4; ++i)
+		g_adwEncryptKey[i] = random();
+
+	tea_encrypt((DWORD *) g_adwDecryptKey, (const DWORD *) g_adwEncryptKey, (const DWORD *) (c_pszKey+37), 16);
+//	TEA_Encrypt((DWORD *) g_adwDecryptKey, (const DWORD *) g_adwEncryptKey, (const DWORD *) (c_pszKey+37), 16);
+}
+#endif
+// END_OF_CHINA_CRYPT_KEY
+
+PyObject * packExist(PyObject * poSelf, PyObject * poArgs)
+{
+	char * strFileName;
+
+	if (!PyTuple_GetString(poArgs, 0, &strFileName))
+		return Py_BuildException();
+
+	return Py_BuildValue("i", CEterPackManager::Instance().isExist(strFileName)?1:0);
+}
+
+PyObject * packGet(PyObject * poSelf, PyObject * poArgs)
+{
+	char * strFileName;
+	
+	if (!PyTuple_GetString(poArgs, 0, &strFileName))
+		return Py_BuildException();
+
+	// 파이썬에서 읽어드리는 패킹 파일은 python 파일과 txt 파일에 한정한다
+	const char* pcExt = strrchr(strFileName, '.');
+	if (pcExt) // 확장자가 있고
+	{
+		if ((stricmp(pcExt, ".py") == 0) ||
+			(stricmp(pcExt, ".pyc") == 0) ||
+			(stricmp(pcExt, ".txt") == 0))
+		{
+			CMappedFile file;
+			const void * pData = NULL;
+
+			if (CEterPackManager::Instance().Get(file,strFileName,&pData))
+				return Py_BuildValue("s#",pData, file.Size());
+		}
+	}
+
+	return Py_BuildException();
+}
+
+void initpack()
+{
+	static PyMethodDef s_methods[] =
+	{
+		{ "Exist",		packExist,		METH_VARARGS },
+		{ "Get",		packGet,		METH_VARARGS },
+		{ NULL, NULL },		
+	};
+	
+	Py_InitModule("pack", s_methods);
+}