port 2A step 2: copy the 40250 header closure into the port mirror

76 closure headers (EterBase, EterLocale, EterPack, EterLib, GameLib, MilesLib,
EffectLib, SphereLib, EterImageLib) copied by the new port_copy.py (CP949->UTF-8,
LF, include-path case only); platform-class headers go to the mirror path too, as
the interface platform/ implements. Six manual `// PORT:` edits (Random, Singleton,
Pool, Stl, Utils, FlyTarget).

- common/D3D8Types.h: D3D8 value types with SDK values/layout, opaque COM interfaces
- common/shim/sdk (d3d8/d3dx8/mss) on every platform, common/shim/win32 off Windows
- Win32Types/Win32Crt: HRESULT, GUID, LARGE_INTEGER, LOGFONT/TEXTMETRIC, _atoi64,
  CRITICAL_SECTION on std::recursive_mutex
- header gate prepends each library's StdAfx.h (40250's precompiled header)

port_gate: macOS, Android, iOS, Windows (mingw) PASS; Linux BLOCKED (no toolchain).
ScriptLib/EterPythonLib/UserInterface wait for 2P (their StdAfx includes Python).

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

extension/src/port/MilesLib/SoundBase.h

@@ -0,0 +1,37 @@
+#ifndef __MILESLIB_CSOUNDBASE_H__
+#define __MILESLIB_CSOUNDBASE_H__
+
+#include <map>
+#include <vector>
+#include "SoundData.h"
+
+typedef struct SProvider
+{
+	char*		name;
+	HPROVIDER	hProvider;
+} TProvider;
+
+typedef std::map<DWORD, CSoundData*> TSoundDataMap;
+
+class CSoundBase
+{
+	public:
+		CSoundBase();
+		virtual ~CSoundBase();
+
+		void					Initialize();
+		void					Destroy();
+
+		CSoundData *			AddFile(DWORD dwFileCRC, const char* filename);
+		DWORD					GetFileCRC(const char* filename);
+
+	protected:
+		static int								ms_iRefCount;
+		static HDIGDRIVER						ms_DIGDriver;
+		static TProvider *						ms_pProviderDefault;
+		static std::vector<TProvider>			ms_ProviderVector;
+		static TSoundDataMap					ms_dataMap;
+		static bool								ms_bInitialized;
+};
+
+#endif