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/Bullets/PurpleCrystal.gd

@@ -3,12 +3,12 @@ extends BulletBase
 func ai():
 	PresetBulletAI.forward(self, rotation)
 func destroy(_beacuseMap: bool):
-	var eff = EffectController.create(preload("res://components/Effects/PurpleCrystalExplosion.tscn"), global_position)
+	var eff = EffectController.create(load("res://components/Effects/PurpleCrystalExplosion.tscn"), global_position)
 	eff.rotation = rotation
 	eff.shot()
 func split(index, total, _last):
 	BulletBase.generate(
-		preload("res://components/Bullets/PurpleCrystal.tscn"),
+		load("res://components/Bullets/PurpleCrystal.tscn"),
 		launcher,
 		position,
 		rotation + deg_to_rad(360 / total * index),
@@ -17,7 +17,7 @@ func split(index, total, _last):
 	)
 func refract(entity, _index, _total, _last):
 	BulletBase.generate(
-		preload("res://components/Bullets/PurpleCrystal.tscn"),
+		load("res://components/Bullets/PurpleCrystal.tscn"),
 		launcher,
 		position,
 		position.angle_to_point(entity.position) if is_instance_valid(entity) else randf_range(0, deg_to_rad(360)),