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>

audit/contracts/combat.attack-combo-damage.md

@@ -65,7 +65,7 @@
 - `project/combat_fx_test.gd`：攻击锁定、连击段、hit window、命中去重、击退、抗击倒、弓箭 target/shoot 时序。
 - `project/combat_parity_test.gd`：攻击锁、伤害数字和受击反馈。
 - `project/gamescene_test.gd`：world reset 清理旧弓箭 FLY/CG_SHOOT 队列。
-- `extension/tests/net_state_queue_test.cpp`：远端 `FUNC_ATTACK`、`FUNC_COMBO`、`FUNC_SKILL` 到达/动作状态。
+- `tests/port/net_state_queue_test.cpp`：远端 `FUNC_ATTACK`、`FUNC_COMBO`、`FUNC_SKILL` 到达/动作状态。
 
 ### Active GameLib weapon-trace review