fix(boss): 调整熊boss的攻击伤害和阶段属性

降低熊boss所有攻击技能的伤害值，并重新设计阶段属性
调整ArrowSeven子弹的材质和位置
添加1%概率直接进入阶段2的机制

scripts/Contents/Bullets/BossAttack/Bear/ArrowSeven.gd

@@ -13,8 +13,7 @@ var forwarded: bool = false
 
 func register():
 	speed = 1
-	damage = 5
-	penerate = 1
+	damage = 2
 func spawn():
 	myColor = allColor.gradient.sample(randf())
 	superlight.material = superlight.material.duplicate()

scripts/Contents/Bullets/BossAttack/Bear/ForeverRainbow.gd

@@ -5,7 +5,7 @@ extends BulletBase
 var myColor: Color
 
 func register():
-	damage = 15
+	damage = 3
 	penerate = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())

scripts/Contents/Bullets/BossAttack/Bear/LightGun.gd

@@ -10,7 +10,7 @@ extends BulletBase
 var myColor: Color
 func register():
 	speed = 1
-	damage = 5
+	damage = 1.5
 	penerate = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())

scripts/Contents/Bullets/BossAttack/Bear/SunDance.gd

@@ -11,7 +11,7 @@ var myColor: Color
 
 func register():
 	speed = 0
-	damage = 10
+	damage = 4
 	penerate = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())