feat: add AI command suggestions extension for Tiptap editor

- Implemented Commands plugin to handle command suggestions triggered by '@' character.
- Created suggestion configuration to filter and render command items.
- Added various command items including date, time, formatting, templates, and task management commands.
- Introduced CSS styles for the Tiptap editor to enhance UI.
- Configured TypeScript settings and Vite build for the project.

readme.md

@@ -0,0 +1,15 @@
+# simple-lit-vite
+
+这是一个使用 Vite 构建的简单 Lit 项目模板。您可以使用此模板快速启动一个新的 Lit 项目，并利用 AI 助手生成代码片段以加速开发过程。少用git。
+
+## cli
+
+```sh
+ev sync clone -i https://kevisual.cn/root/ai/kevisual/frontend/simple-lit-vite/kevisual.json
+```
+
+## 同步命令
+```sh
+ev sync list
+ev sync upload
+```