feat(游戏内容): 添加猫角色及相关资源

添加新的猫角色，包括角色脚本、音效、贴图和场景配置
修改Wave.gd以包含猫角色生成
调整EntityBase.gd的武器图标重建逻辑
更新部分粒子效果和音效资源

scripts/Contents/Characters/Cat.gd

@@ -0,0 +1,18 @@
+extends EntityBase
+class_name Maodie
+
+func register():
+	fields[FieldStore.Entity.MAX_HEALTH] = 75
+	fields[FieldStore.Entity.MOVEMENT_SPEED] = randf_range(0.5, 0.8)
+	attackCooldownMap[0] = randi_range(2500, 6000)
+	sprintMultiplier = 20
+func ai():
+	PresetEntityAI.follow(self, currentFocusedBoss)
+	tryAttack(0, true)
+func attack(type: int):
+	if type == 0:
+		BulletBase.generate(ComponentManager.getBullet("ChickSprint"), self, position, 0)
+		trySprint()
+	return true
+func sprint():
+	move((currentFocusedBoss.position - position).normalized() * sprintMultiplier, true)