feat(core): 初始化项目基础架构和CMS功能模块

- 添加Docker相关配置文件(.dockerignore, .env.example, .gitignore)
- 实现服务端API代理功能，支持文件、模块和服务器API转发
- 创建文章详情页、栏目文章列表页和单页内容展示页面
- 集成Ant Design Vue组件库并实现SSR样式提取功能
- 定义API响应数据结构类型和应用布局组件
- 开发开发者应用中心和文章管理页面
- 实现CMS导航菜单获取和多租户切换功能

app/layouts/default.vue

@@ -0,0 +1,78 @@
+<template>
+  <a-spin :spinning="spinning" size="large" tip="加载中..." class="layout-spin">
+    <a-layout class="min-h-screen layout-shell" :class="{ 'layout-shell--pending': spinning }">
+      <SiteHeader />
+      <a-layout-content class="content">
+        <slot />
+      </a-layout-content>
+      <SiteFooter />
+    </a-layout>
+  </a-spin>
+</template>
+
+<script setup lang="ts">
+import SiteFooter from '@/components/SiteFooter.vue'
+import SiteHeader from '@/components/SiteHeader.vue'
+import { nextTick } from 'vue'
+
+const nuxtApp = useNuxtApp()
+const bootstrapping = ref(true)
+const navigating = ref(false)
+const siteInfoTimeoutReached = ref(false)
+
+const { pending: siteInfoPending, error: siteInfoError } = useSiteInfo()
+
+const siteInfoBlocking = computed(
+  () => siteInfoPending.value && !siteInfoError.value && !siteInfoTimeoutReached.value
+)
+
+const spinning = computed(() => bootstrapping.value || navigating.value || siteInfoBlocking.value)
+
+if (import.meta.client) {
+  nuxtApp.hooks.hook('page:start', () => {
+    navigating.value = true
+  })
+
+  nuxtApp.hooks.hook('page:finish', () => {
+    navigating.value = false
+  })
+
+  onMounted(async () => {
+    // Wait for hydration + one paint to reduce CSS flicker (antdv cssinjs / tailwind).
+    await nextTick()
+    requestAnimationFrame(() => {
+      bootstrapping.value = false
+    })
+
+    // Never let an external API stall the whole UI forever.
+    window.setTimeout(() => {
+      siteInfoTimeoutReached.value = true
+    }, 2500)
+  })
+}
+</script>
+
+<style scoped>
+.content {
+  background: transparent;
+}
+
+.layout-shell {
+  transition: opacity 0.12s ease;
+}
+
+.layout-shell--pending {
+  opacity: 0;
+  pointer-events: none;
+}
+
+.layout-spin {
+  display: block;
+  min-height: 100vh;
+}
+
+.layout-spin :deep(.ant-spin-nested-loading),
+.layout-spin :deep(.ant-spin-container) {
+  min-height: 100vh;
+}
+</style>