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Add Vue components and API client for managing user custom attributes.

- Add userAttributes API client with CRUD operations
- Add UserAttributeForm component for displaying/editing attribute values
- Add UserAttributesConfigModal for attribute definition management
- Support all attribute types: text, textarea, number, email, url,
  date, select, multi_select

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

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

- 移除所有语句末尾分号
- 统一对象属性尾随逗号格式
- 优化类型定义导入顺序
- 提升代码一致性和可读性