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>

tools/perf/pull_perf_logs.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+# Copies the Android client's --perf-log files (src/host/perf_log.h) to ./perf-logs and prints a
+# summary of the newest one. The phone must be connected with USB debugging; the files can also be
+# taken off the phone without a PC from Android/data/org.metin2port.client/files/perf.
+set -e
+PKG=org.metin2port.client
+OUT=${1:-perf-logs}
+mkdir -p "$OUT"
+adb pull "/sdcard/Android/data/$PKG/files/perf/." "$OUT"
+newest=$(ls -t "$OUT"/perf-*.csv 2>/dev/null | head -1)
+[ -n "$newest" ] && python3 "$(dirname "$0")/perf_summary.py" "$newest"