chore：完善项目目录结构和基础框架

- 添加核心系统框架目录结构
- 创建游戏模块化组织架构
- 添加数据配置和本地化支持
- 建立脚本分类管理体系
- 创建场景预制件管理目录

core/managers/SceneManager.gd

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+extends Node
+
+# 场景管理器 - 负责场景切换和管理
+# 提供场景切换的统一接口
+
+signal scene_changed(scene_name: String)
+signal scene_change_started(scene_name: String)
+
+var current_scene_name: String = ""
+var is_changing_scene: bool = false
+
+# 场景路径映射
+var scene_paths: Dictionary = {
+	"main": "res://scenes/main_scene.tscn",
+	"auth": "res://scenes/auth_scene.tscn",
+	"game": "res://scenes/game_scene.tscn",
+	"battle": "res://scenes/battle_scene.tscn",
+	"inventory": "res://scenes/inventory_scene.tscn",
+	"shop": "res://scenes/shop_scene.tscn",
+	"settings": "res://scenes/settings_scene.tscn"
+}
+
+func _ready():
+	print("SceneManager 初始化完成")
+
+func change_scene(scene_name: String, use_transition: bool = true):
+	if is_changing_scene:
+		print("场景切换中，忽略新的切换请求")
+		return false
+	
+	if not scene_paths.has(scene_name):
+		print("错误: 未找到场景 ", scene_name)
+		return false
+	
+	var scene_path = scene_paths[scene_name]
+	print("开始切换场景: ", current_scene_name, " -> ", scene_name)
+	
+	is_changing_scene = true
+	scene_change_started.emit(scene_name)
+	
+	if use_transition:
+		await show_transition()
+	
+	var error = get_tree().change_scene_to_file(scene_path)
+	if error != OK:
+		print("场景切换失败: ", error)
+		is_changing_scene = false
+		return false
+	
+	current_scene_name = scene_name
+	is_changing_scene = false
+	scene_changed.emit(scene_name)
+	
+	if use_transition:
+		await hide_transition()
+	
+	print("场景切换完成: ", scene_name)
+	return true
+
+func get_current_scene_name() -> String:
+	return current_scene_name
+
+func register_scene(scene_name: String, scene_path: String):
+	scene_paths[scene_name] = scene_path
+	print("注册场景: ", scene_name, " -> ", scene_path)
+
+func show_transition():
+	# TODO: 实现场景切换过渡效果
+	print("显示场景切换过渡效果")
+	await get_tree().create_timer(0.2).timeout
+
+func hide_transition():
+	# TODO: 隐藏场景切换过渡效果
+	print("隐藏场景切换过渡效果")
+	await get_tree().create_timer(0.2).timeout