feat: 全面完善功能和修复 CSS/API 问题

- 修复暗色主题缺少 --accent 变量导致按钮颜色异常
- 消除所有 CSS 硬编码颜色（btn-primary, btn-danger:hover, sidebar-logo）
- 添加 toast.warning 样式支持
- Modal 支持 Enter 确认和 Escape 关闭
- Dashboard 快速操作按钮添加 loading 状态
- Services 操作后延迟刷新确保状态同步
- Memory 页面添加预览/新建/删除文件功能
- Deploy 页面 .env 路径添加默认值
- Rust 后端补充 delete_memory_file/check_installation/write_env_file 命令
- Mock 数据补全所有 API 端点

src/lib/tauri-api.js

@@ -84,6 +84,9 @@ function mockInvoke(cmd, args) {
     },
     read_memory_file: ({ path }) => `# ${path}\n\n这是 ${path} 的内容示例。\n\n## 概述\n\n在此记录工作记忆...`,
     write_memory_file: () => true,
+    delete_memory_file: () => true,
+    check_installation: () => ({ installed: true, path: '/usr/local/bin/openclaw', version: '2026.2.23' }),
+    get_deploy_config: () => ({ gatewayUrl: 'http://127.0.0.1:18789', authToken: '', version: '2026.2.23' }),
     read_mcp_config: () => ({
       mcpServers: {
         'exa': { command: 'npx', args: ['-y', '@anthropic/exa-mcp-server'], env: { EXA_API_KEY: '***' } },
@@ -124,6 +127,7 @@ export const api = {
   listMemoryFiles: (category) => invoke('list_memory_files', { category }),
   readMemoryFile: (path) => invoke('read_memory_file', { path }),
   writeMemoryFile: (path, content) => invoke('write_memory_file', { path, content }),
+  deleteMemoryFile: (path) => invoke('delete_memory_file', { path }),
 
   // 安装/部署
   checkInstallation: () => invoke('check_installation'),