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>

third_party/minilzo/lzo/lzo1x.h

@@ -0,0 +1,12 @@
+/* Compatibility shim: the full LZO distribution exposes the LZO1X API as
+ * <lzo/lzo1x.h>. We vendor only miniLZO (LZO1X-1 compressor + safe/standard
+ * LZO1X decompressor), which is all mtproto's CLZO path needs
+ * (lzo_init / lzo1x_decompress_safe / LZO_E_OK / lzo_uint). This header lets
+ * extension/src/proto/proto.cpp keep its `#include <lzo/lzo1x.h>` unchanged.
+ */
+#ifndef MTGODOT_MINILZO_LZO1X_SHIM_H
+#define MTGODOT_MINILZO_LZO1X_SHIM_H
+
+#include "../minilzo.h"
+
+#endif