feat(武器): 增强红水晶武器爆炸效果

修改红水晶武器爆炸时生成的水晶碎片数量逻辑，从固定数量改为1~N随机数量
更新相关描述文本以反映新的随机数量机制

scripts/Contents/Bullets/RedCrystal.gd

@@ -3,6 +3,7 @@ class_name RedCrystalBullet
 
 var radius: float = 0
 var percent: float = 0
+var count: int = 0
 
 func register():
 	hitbox.shape = hitbox.shape.duplicate()
@@ -12,7 +13,8 @@ func ai():
 func destroy(_beacuseMap: bool):
 	hitbox.shape.radius = radius
 	EffectController.create(ComponentManager.getEffect("RedCrystalExplosion"), global_position).shot()
-	for bullet in BulletBase.generate(ComponentManager.getBullet("CrystalBlock"), launcher, position, deg_to_rad(randf_range(0, 360))):
-		if bullet is CrystalBlockBullet:
-			bullet.baseDamage = baseDamage * percent
+	for i in randi_range(1, count):
+		for bullet in BulletBase.generate(ComponentManager.getBullet("CrystalBlock"), launcher, position, deg_to_rad(randf_range(0, 360))):
+			if bullet is CrystalBlockBullet:
+				bullet.baseDamage = baseDamage * percent
 	await TickTool.millseconds(100)