feat: 닥공전 기능 추가

- 장수 상대로 공격자인 경우
  - 공, 방 50%씩

hwe/sammo/ActionScenarioEffect/event_StrongAttacker.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace sammo\ActionScenarioEffect;
+
+use \sammo\iAction;
+use sammo\WarUnit;
+use sammo\WarUnitCity;
+
+class event_StrongAttacker implements iAction
+{
+    use \sammo\DefaultAction;
+
+    public function getWarPowerMultiplier(WarUnit $unit): array
+    {
+        if ($unit instanceof WarUnitCity) {
+            return [1, 1];
+        }
+        if ($unit->getOppose() instanceof WarUnitCity) {
+            return [1, 1];
+        }
+
+        if ($unit->isAttacker()) {
+            return [1.5, 0.667];
+        }
+        return [1, 1];
+    }
+}