- 优化el-select组件的暗色主题样式，包括输入框、下拉菜单、选中状态等
- 在Agents、MCP、ModelAPIs页面中将原生select替换为Element Plus el-select组件
- 提升UI一致性和用户体验
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Reorganize project structure: move frontend to web/ directory
- Add Database page with connection list (name, type, subtables, status, created, actions)
- Integrate Element Plus for UI components with dark theme support
- Add Quicksand font for rounded UI design
- Configure root package.json to run frontend from web/ directory
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
