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/mt_register.rc

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# PROVIDE: mt_register
+# REQUIRE: LOGIN mysql
+# KEYWORD: shutdown
+#
+# Account registration service for the 40250 server (tools/server/register_server.py).
+# Install: /usr/local/etc/rc.d/mt_register, then `sysrc mt_register_enable=YES`.
+
+. /etc/rc.subr
+
+name=mt_register
+rcvar=mt_register_enable
+load_rc_config $name
+
+: ${mt_register_enable:=NO}
+: ${mt_register_dir:=/usr/metin2/server/register}
+
+pidfile=/var/run/${name}.pid
+procname=/usr/local/bin/python3.9
+command=/usr/sbin/daemon
+command_args="-f -p ${pidfile} -o ${mt_register_dir}/register.log ${procname} ${mt_register_dir}/register_server.py"
+
+run_rc_command "$1"