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backend/src/main/java/com/zombie/game/systems/FireZoneSystem.java

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+package com.zombie.game.systems;
+
+import com.zombie.game.ecs.ECSWorld;
+import com.zombie.game.ecs.System;
+import com.zombie.game.ecs.components.*;
+
+import java.util.*;
+
+/**
+ * 燃烧区域系统
+ *
+ * 处理燃烧瓶留下的火焰区域：持续伤害 + 生命周期。
+ */
+public class FireZoneSystem implements System {
+
+    @Override
+    public void update(float dt, ECSWorld world) {
+        List<Integer> toRemove = new ArrayList<>();
+
+        for (int entityId : world.getFireZones()) {
+            FireZone fz = world.getFireZonesData().get(entityId);
+            Position fzPos = world.getPositions().get(entityId);
+            if (fz == null || fzPos == null) continue;
+
+            fz.update(dt);
+
+            // 对范围内的僵尸造成持续伤害
+            for (int zombieId : world.getZombies()) {
+                Health zombieHealth = world.getHealths().get(zombieId);
+                Position zombiePos = world.getPositions().get(zombieId);
+                if (zombieHealth == null || !zombieHealth.isAlive() || zombiePos == null) continue;
+
+                float dist = fzPos.distanceTo(zombiePos.getX(), zombiePos.getY());
+                if (dist < fz.getRadius()) {
+                    zombieHealth.takeDamage(fz.getDamagePerTick());
+                }
+            }
+
+            if (fz.isExpired()) {
+                toRemove.add(entityId);
+            }
+        }
+
+        for (int id : toRemove) {
+            world.getFireZones().remove(id);
+            world.destroyEntity(id);
+        }
+    }
+}