chore(nuxt): 清理生成文件和类型声明文件

- 删除 .nuxt 目录下的类型声明和配置文件
- 删除构建相关的声明模块
- 添加 .gitignore 以忽略构建产物和依赖目录
- 移除冗余的 Nuxt 配置和类型定义文件
- 清理无用的组件声明和类型文件

.nuxt/mdc-imports.mjs

@@ -1,12 +0,0 @@
-import _RemarkEmoji from 'remark-emoji'
-import _Highlight from '/Users/gxwebsoft/VUE/tiantian-system/node_modules/.pnpm/@nuxtjs+mdc@0.20.2_magicast@0.5.1/node_modules/@nuxtjs/mdc/dist/runtime/highlighter/rehype-nuxt.js'
-
-export const remarkPlugins = {
-  'remark-emoji': { instance: _RemarkEmoji },
-}
-
-export const rehypePlugins = {
-  'highlight': { instance: _Highlight, options: {} },
-}
-
-export const highlight = {"theme":{"default":"github-light","dark":"github-dark"}}