feat：实现登录系统和用户认证功能

- 添加登录场景（login_scene.tscn）和主菜单场景（main_menu_scene.tscn）
- 实现认证管理器（AuthManager）用于用户登录和会话管理
- 添加核心服务：加密服务、存储服务、网络服务
- 配置项目主场景为登录场景
- 添加自动加载服务到项目配置
- 添加开发环境配置（VSCode、Claude）

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

scripts/data/ErrorCode.gd

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+class_name ErrorCode
+
+## 错误码定义
+## 用于统一管理登录系统中的所有错误码和错误消息
+
+# 成功
+const SUCCESS: int = 0
+
+# 网络相关错误 (1000-1999)
+const NETWORK_ERROR: int = 1001
+const TIMEOUT: int = 1002
+const SERVER_ERROR: int = 1003
+
+# 输入验证错误 (2000-2999)
+const INVALID_INPUT: int = 2001
+const INVALID_USERNAME: int = 2002
+const INVALID_PASSWORD: int = 2003
+const PASSWORDS_NOT_MATCH: int = 2004
+
+# 认证相关错误 (3000-3999)
+const WRONG_CREDENTIALS: int = 3001
+const USER_NOT_FOUND: int = 3002
+const ACCOUNT_DISABLED: int = 3003
+const TOKEN_EXPIRED: int = 3004
+const TOKEN_INVALID: int = 3005
+
+# 错误消息映射
+const MESSAGES: Dictionary = {
+	NETWORK_ERROR: "网络连接失败，请检查网络设置",
+	TIMEOUT: "请求超时，请稍后重试",
+	SERVER_ERROR: "服务器错误，请稍后重试",
+	INVALID_INPUT: "用户名或密码不能为空",
+	INVALID_USERNAME: "用户名格式不正确（3-16个字符）",
+	INVALID_PASSWORD: "密码格式不正确（6-20个字符）",
+	PASSWORDS_NOT_MATCH: "两次输入的密码不一致",
+	WRONG_CREDENTIALS: "用户名或密码错误",
+	USER_NOT_FOUND: "用户不存在",
+	ACCOUNT_DISABLED: "账号已被禁用",
+	TOKEN_EXPIRED: "登录已过期，请重新登录",
+	TOKEN_INVALID: "登录状态无效，请重新登录"
+}
+
+## 获取错误消息
+static func getMessage(errorCode: int) -> String:
+	return MESSAGES.get(errorCode, "未知错误 (代码: %d)" % errorCode)

scripts/data/ErrorCode.gd.uid

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+uid://cfrgxhalop5rg

scripts/data/UserData.gd

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+class_name UserData
+
+## 用户数据类
+## 用于存储用户的基本信息
+
+var id: String = ""
+var username: String = ""
+var nickname: String = ""
+var email: String = ""
+var phone: String = ""
+var avatarUrl: String = ""
+var role: int = 1
+var createdAt: String = ""
+
+# 兼容旧字段
+var level: int = 1
+var exp: int = 0
+var createTime: int = 0
+
+## 从字典创建 UserData 对象
+static func fromDict(data: Dictionary) -> UserData:
+	var userData = UserData.new()
+
+	# 新字段（处理可能为 null 的值）
+	userData.id = str(data.get("id", ""))
+	userData.username = _getStringOrEmpty(data, "username")
+	userData.nickname = _getStringOrEmpty(data, "nickname")
+	userData.email = _getStringOrEmpty(data, "email")
+	userData.phone = _getStringOrEmpty(data, "phone")
+	userData.avatarUrl = _getStringOrEmpty(data, "avatar_url", _getStringOrEmpty(data, "avatarUrl"))
+	userData.role = int(data.get("role", 1))
+	userData.createdAt = _getStringOrEmpty(data, "created_at", _getStringOrEmpty(data, "createdAt"))
+
+	# 兼容旧字段
+	userData.level = data.get("level", 1)
+	userData.exp = data.get("exp", 0)
+	userData.createTime = data.get("create_time", data.get("createTime", 0))
+
+	return userData
+
+## 辅助方法：从字典中获取字符串，如果为 null 则返回空字符串
+static func _getStringOrEmpty(data: Dictionary, key: String, defaultValue: String = "") -> String:
+	var value = data.get(key, defaultValue)
+	if value == null:
+		return ""
+	return str(value)
+
+## 转换为字典
+func toDict() -> Dictionary:
+	return {
+		"id": id,
+		"username": username,
+		"nickname": nickname,
+		"email": email,
+		"phone": phone,
+		"avatar_url": avatarUrl,
+		"role": role,
+		"created_at": createdAt,
+		"level": level,
+		"exp": exp,
+		"create_time": createTime
+	}
+
+## 打印用户信息（用于调试）
+func toString() -> String:
+	return "UserData(id=%s, username=%s, nickname=%s, role=%d)" % [id, username, nickname, role]

scripts/data/UserData.gd.uid

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+uid://bxcp8nyo8mha7