feat: AutoSSL certificate management tool with Web UI

frontend/src/App.vue

@@ -0,0 +1,97 @@
+<template>
+  <div id="app">
+    <el-container style="min-height: 100vh">
+      <el-header class="app-header">
+        <div class="header-left">
+          <el-icon :size="24"><Link /></el-icon>
+          <span class="header-title">AutoSSL 证书管理</span>
+        </div>
+        <div class="header-right">
+          <el-tag type="success" size="small">运行中</el-tag>
+        </div>
+      </el-header>
+      <el-container>
+        <el-aside width="200px">
+          <el-menu
+            :default-active="route.path"
+            router
+            background-color="#001529"
+            text-color="#ffffffb3"
+            active-text-color="#fff"
+          >
+            <el-menu-item index="/">
+              <el-icon><HomeFilled /></el-icon>
+              <span>仪表盘</span>
+            </el-menu-item>
+            <el-menu-item index="/certificates">
+              <el-icon><Document /></el-icon>
+              <span>证书列表</span>
+            </el-menu-item>
+            <el-menu-item index="/create">
+              <el-icon><Plus /></el-icon>
+              <span>申请证书</span>
+            </el-menu-item>
+          </el-menu>
+        </el-aside>
+        <el-main>
+          <router-view />
+        </el-main>
+      </el-container>
+    </el-container>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { useRoute } from 'vue-router'
+const route = useRoute()
+</script>
+
+<style>
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  background-color: #f0f2f5;
+}
+
+.app-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  background: linear-gradient(135deg, #1890ff, #096dd9);
+  color: white;
+  padding: 0 24px;
+  height: 60px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
+}
+
+.header-left {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.header-title {
+  font-size: 20px;
+  font-weight: 600;
+  letter-spacing: 1px;
+}
+
+.el-aside {
+  background-color: #001529;
+  min-height: calc(100vh - 60px);
+}
+
+.el-menu {
+  border-right: none;
+}
+
+.el-main {
+  background-color: #f0f2f5;
+  padding: 24px;
+}
+</style>