refactor(资源加载): 将preload替换为load以优化内存使用

统一使用load方法动态加载资源，减少启动时的内存占用
移动Manager类到Tools/Managers目录下
修复DirTool处理remap文件的问题

scripts/Contents/Characters/Hen.gd

@@ -14,5 +14,5 @@ func attack(type):
 	if type == 0:
 		var weaponPos = findWeaponAnchor("normal")
 		for i in randi_range(1, 4):
-			BulletBase.generate(preload("res://components/Bullets/Star.tscn"), self, weaponPos, (currentFocusedBoss.position - position).angle())
+			BulletBase.generate(load("res://components/Bullets/Star.tscn"), self, weaponPos, (currentFocusedBoss.position - position).angle())
 	return true