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/EterLib/Thread.h

@@ -0,0 +1,28 @@
+#ifndef __INC_ETERLIB_THREAD_H__
+#define __INC_ETERLIB_THREAD_H__
+
+class CThread
+{
+	public:
+		CThread();
+		int Create(void * arg);
+		
+	protected:
+		static UINT CALLBACK	EntryPoint(void * pThis);
+
+		virtual UINT			Setup() = 0;				// Execute이 불려지기 전에 불려진다.
+		virtual UINT			Execute(void * arg) = 0;	// 실제 쓰레드가 하는 일이 들어가는 곳
+
+		UINT					Run(void * arg);
+
+		void *					Arg() const		{ return m_pArg; }
+		void					Arg(void * arg) { m_pArg = arg; }
+		
+		HANDLE					m_hThread;
+
+	private:
+		void *					m_pArg;
+		unsigned				m_uThreadID;
+};
+
+#endif