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/Tools/Managers/WorldManager.gd

@@ -0,0 +1,17 @@
+extends Node2D
+class_name WorldManager
+
+static var rootNode: Node2D
+static var tree: SceneTree
+static var runningTime: int = 0
+
+func _ready():
+	tree = get_tree()
+	rootNode = self
+func _physics_process(delta):
+	runningTime += delta * 1000
+	if EntityBase.mobCount() == 0 and runningTime > 3000:
+		UIState.setPanel("MakeFeed")
+
+static func getTime():
+	return runningTime