fix(Characters): 修复Bear冲刺时未检查boss有效性的问题

修复Bear.gd中sprint函数未检查currentFocusedBoss是否有效的问题，避免潜在崩溃
调整TickTool.gd中until方法的frame调用方式
修改Wave.gd测试环境下的初始波次配置

scripts/Tools/TickTool.gd

@@ -7,7 +7,7 @@ static func frame(count: int = 1):
 		await WorldManager.tree.physics_frame
 static func until(predicate: Callable):
 	while not predicate.call():
-		await frame()
+		await frame.unbind(1).call(0)
 static func modifyAnimationKey(animator: AnimationPlayer, name: String, track: NodePath, trackType: Animation.TrackType, time: float, value: Variant):
 	var animation = animator.get_animation(name)
 	var trackIdx = animation.find_track(track, trackType)