feat: 初始化项目结构并添加基础配置

添加前后端基础项目结构，包括.gitignore、package.json等配置文件
实现前端基础功能模块，包括路由、状态管理、API请求封装等
添加前端UI组件库和样式体系
配置开发环境Mock系统和构建工具链

front-end/library/components/VabLanguage/index.vue

@@ -0,0 +1,30 @@
+<script lang="ts" setup>
+    import { useSettingsStore } from '@/store/modules/settings'
+    import getPageTitle from '@/utils/pageTitle'
+
+    const { locale } = useI18n()
+
+    const route = useRoute()
+
+    const settingsStore = useSettingsStore()
+    const { theme } = storeToRefs(settingsStore)
+    const { changeLanguage } = settingsStore
+
+    const handleCommand = (language: string) => {
+        changeLanguage(language)
+        locale.value = language
+        document.title = getPageTitle(route.meta.title)
+    }
+</script>
+
+<template>
+    <el-dropdown v-if="theme.showLanguage" @command="handleCommand">
+        <vab-icon icon="translate" />
+        <template #dropdown>
+            <el-dropdown-menu>
+                <el-dropdown-item command="zh">中文简体</el-dropdown-item>
+                <el-dropdown-item command="en">English</el-dropdown-item>
+            </el-dropdown-menu>
+        </template>
+    </el-dropdown>
+</template>