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

scripts/scenes/MainScene.gd

@@ -0,0 +1,116 @@
+extends Control
+
+# 场景节点引用
+@onready var auth_scene: Control = $AuthScene
+@onready var main_game_ui: Control = $MainGameUI
+@onready var user_label: Label = $MainGameUI/TopBar/HBoxContainer/UserLabel
+@onready var logout_button: Button = $MainGameUI/TopBar/HBoxContainer/LogoutButton
+
+# 游戏功能按钮
+@onready var explore_button: Button = $MainGameUI/MainContent/CenterContainer/VBoxContainer/GameMenuGrid/ExploreButton
+@onready var inventory_button: Button = $MainGameUI/MainContent/CenterContainer/VBoxContainer/GameMenuGrid/InventoryButton
+@onready var shop_button: Button = $MainGameUI/MainContent/CenterContainer/VBoxContainer/GameMenuGrid/ShopButton
+@onready var friends_button: Button = $MainGameUI/MainContent/CenterContainer/VBoxContainer/GameMenuGrid/FriendsButton
+
+# 状态标签
+@onready var level_label: Label = $MainGameUI/MainContent/CenterContainer/VBoxContainer/StatusPanel/StatusContainer/StatusGrid/LevelLabel
+@onready var coins_label: Label = $MainGameUI/MainContent/CenterContainer/VBoxContainer/StatusPanel/StatusContainer/StatusGrid/CoinsLabel
+@onready var exp_label: Label = $MainGameUI/MainContent/CenterContainer/VBoxContainer/StatusPanel/StatusContainer/StatusGrid/ExpLabel
+@onready var energy_label: Label = $MainGameUI/MainContent/CenterContainer/VBoxContainer/StatusPanel/StatusContainer/StatusGrid/EnergyLabel
+
+# 游戏状态
+enum GameState {
+	AUTH,      # 登录/注册状态
+	MAIN_GAME  # 主游戏状态
+}
+
+var current_state: GameState = GameState.AUTH
+var current_user: String = ""
+
+# 玩家数据
+var player_level: int = 1
+var player_coins: int = 100
+var player_exp: int = 0
+var player_max_exp: int = 100
+var player_energy: int = 100
+var player_max_energy: int = 100
+
+func _ready():
+	# 初始化游戏状态
+	setup_game()
+	
+	# 连接登录成功信号
+	auth_scene.login_success.connect(_on_login_success)
+	
+	# 连接按钮信号
+	logout_button.pressed.connect(_on_logout_pressed)
+	explore_button.pressed.connect(_on_explore_pressed)
+	inventory_button.pressed.connect(_on_inventory_pressed)
+	shop_button.pressed.connect(_on_shop_pressed)
+	friends_button.pressed.connect(_on_friends_pressed)
+
+func setup_game():
+	# 设置初始状态为登录界面
+	show_auth_scene()
+
+func show_auth_scene():
+	current_state = GameState.AUTH
+	auth_scene.visible = true
+	main_game_ui.visible = false
+
+func show_main_game():
+	current_state = GameState.MAIN_GAME
+	auth_scene.visible = false
+	main_game_ui.visible = true
+	user_label.text = "当前用户: " + current_user
+	update_player_status()
+	print("进入主游戏界面")
+
+func update_player_status():
+	level_label.text = "等级: " + str(player_level)
+	coins_label.text = "金币: " + str(player_coins)
+	exp_label.text = "经验: " + str(player_exp) + "/" + str(player_max_exp)
+	energy_label.text = "体力: " + str(player_energy) + "/" + str(player_max_energy)
+
+func _on_login_success(username: String):
+	# 登录成功后的处理
+	current_user = username
+	print("用户 ", username, " 登录成功！")
+	show_main_game()
+
+func _on_logout_pressed():
+	# 登出处理
+	current_user = ""
+	show_auth_scene()
+
+# 游戏功能按钮处理
+func _on_explore_pressed():
+	print("探索小镇功能")
+	show_game_message("🗺️ 探索功能开发中...")
+
+func _on_inventory_pressed():
+	print("背包功能")
+	show_game_message("🎒 背包功能开发中...")
+
+func _on_shop_pressed():
+	print("商店功能")
+	show_game_message("🏪 商店功能开发中...")
+
+func _on_friends_pressed():
+	print("好友功能")
+	show_game_message("👥 好友功能开发中...")
+
+func show_game_message(message: String):
+	print("游戏消息: ", message)
+	# 这里可以添加UI提示框显示消息
+
+# 处理全局输入
+func _input(event):
+	if event.is_action_pressed("ui_cancel"):
+		match current_state:
+			GameState.AUTH:
+				# 在登录界面按ESC退出游戏
+				get_tree().quit()
+			GameState.MAIN_GAME:
+				# 在游戏中按ESC可能显示菜单或返回登录
+				show_auth_scene()