layout: restructure into src/ tests/ android/ scripts/ tools/

- extension/src/{port,platform,codepage} -> src/; native_render -> src/host
  (+ dxt, shaders/); libgr2 -> src/gr2; extension/third_party -> third_party
- extension/tests -> tests/port, libgr2/tests -> tests/gr2
- android-native -> android (build.sh, push-client.sh moved in)
- script -> scripts; tools/40250 -> tools/server; oracle -> tools/granny-oracle;
  perf tools -> tools/perf
- all build trees under build/ (native, release, android, port-gate)
- xrender:: CMake aliases -> mt::; port-map ledger impl paths rewritten

No code changes. ctest 15/15, port_gate macos+android PASS, port_map check 0 errors.

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

src/port/EterBase/FileBase.h

@@ -0,0 +1,40 @@
+#ifndef __INC_ETERBASE_FILEBASE_H__
+#define __INC_ETERBASE_FILEBASE_H__
+
+#include <windows.h>
+
+class CFileBase
+{
+	public:
+		enum EFileMode
+		{
+			FILEMODE_READ = (1 << 0),
+			FILEMODE_WRITE = (1 << 1)
+		};
+
+		CFileBase();
+		virtual	~CFileBase();
+
+		void			Destroy();
+		void			Close();
+		
+		BOOL			Create(const char* filename, EFileMode mode);
+		DWORD			Size();
+		void			SeekCur(DWORD size);
+		void			Seek(DWORD offset);
+		DWORD			GetPosition();
+
+		virtual BOOL	Write(const void* src, int bytes);
+		BOOL			Read(void* dest, int bytes);
+
+		char*			GetFileName();
+		BOOL			IsNull();
+		
+	protected:
+		int				m_mode;
+		char			m_filename[MAX_PATH+1];
+		HANDLE			m_hFile;
+		DWORD			m_dwSize;
+};
+
+#endif