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/server/run_classic_e2e.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+set -eu
+
+cli=${MT_CLASSIC_E2E:-${MTGODOT_CLASSIC_E2E:-}}
+if [ -z "$cli" ]; then
+	build_root=${MT_CLASSIC_BUILD:-${MTGODOT_CLASSIC_BUILD:-build-classic}}
+	cli="$build_root/net_classic_e2e_host"
+fi
+if [ ! -x "$cli" ]; then
+	echo "run_classic_e2e.sh: missing $cli; build with -DMT_BUILD_NET_TOOLS=ON" >&2
+	exit 2
+fi
+
+host=${MT40250_GAME_HOST:-127.0.0.1}
+port=${MT40250_GAME_PORT:-13000}
+: "${MT40250_ACCOUNT_ID:?set MT40250_ACCOUNT_ID}"
+: "${MT40250_ACCOUNT_PASSWORD:?set MT40250_ACCOUNT_PASSWORD}"
+slot=${MT40250_CHARACTER_SLOT:-0}
+timeout=${MT40250_E2E_TIMEOUT_SECONDS:-30}
+
+exec "$cli" "$host" "$port" "$MT40250_ACCOUNT_ID" "$MT40250_ACCOUNT_PASSWORD" "$slot" "$timeout"