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/Poly/Symbol.h

@@ -0,0 +1,39 @@
+#ifndef __POLY_SYMBOL_H__
+#define __POLY_SYMBOL_H__
+
+#include "Base.h"
+
+#define ST_UNKNOWN	0
+#define ST_PLUS		11
+#define ST_MINUS	12
+#define ST_MULTIPLY	23
+#define ST_DIVIDE	24
+#define ST_CARET	35
+#define ST_OPEN		06
+#define ST_CLOSE	07
+
+#define SY_PLUS		'+'
+#define SY_MINUS	'-'
+#define SY_MULTIPLY	'*'
+#define SY_DIVIDE	'/'
+#define SY_CARET	'^'
+#define SY_OPEN		'('
+#define SY_CLOSE	')'
+
+class CSymbol : public CBase   
+{
+    private:
+	int	iType;
+
+    public:
+	CSymbol();
+	virtual ~CSymbol();
+
+	static int	issymbol(int ch);
+	void		SetType(int Type);
+	int		GetType();
+	bool		Equal(CSymbol dif);
+	bool		Less(CSymbol dif);
+};
+
+#endif