fix(角色平衡): 调整牧羊犬格挡冷却时间和治疗量

将牧羊犬的格挡冷却时间从5秒减少到3秒
将HCN的治疗量从3点提升到5点
移除牧羊犬卡片的clickToRebuild属性

scripts/Contents/Characters/HCN.gd

@@ -1,4 +1,4 @@
 extends PlayerBase
 
 func summoned(entity: SummonBase):
-	entity.died.connect(func(): tryHeal(3))
+	entity.died.connect(func(): tryHeal(5))

scripts/Contents/Characters/MuyangDog.gd

@@ -1,6 +1,6 @@
 extends PlayerBase
 
-var parryCounter: CooldownTimer = CooldownTimer.new(5000)
+var parryCounter: CooldownTimer = CooldownTimer.new(3000)
 
 func ai():
 	super.ai()