feat(app): 添加多模板关于我们页面及相关路由和404页面

- 新增404页面，优化未找到页面体验，避免被搜索引擎索引
- 增加文件代理接口，隐藏真实文件服务器地址，支持文件请求代理
- 实现/article、/case、/product及/page动态路由兼容列表与详情展示
- 添加动态CMS页面兼容入口处理旧式路径，统一路由与SEO设置
- 新增模板1、模板7、模板2、模板3关于我们页面，实现多模板支持
- 模板增强支持CMS单页内容加载及SEO信息动态设置
- 配置环境变量及Git忽略文件规则辅助开发和构建环境管理

app/templates/template-03/pages/NewsDetail.vue

@@ -0,0 +1,63 @@
+<template>
+  <div class="min-h-screen py-16 bg-[#faf6ef]">
+    <div class="container mx-auto px-4 sm:px-6 lg:px-8">
+      <div v-if="article" class="max-w-4xl mx-auto">
+        <div class="mb-8">
+          <NuxtLink :to="`/article${article?.navigationId ? '?navId=' + article.navigationId : ''}`" class="text-sm text-[#8a7d6b] hover:text-[#8b6f47]">← 返回新闻列表</NuxtLink>
+        </div>
+
+        <h1 class="text-3xl sm:text-4xl font-bold text-[#4a3f35] mb-4">
+          {{ article.title }}
+        </h1>
+
+        <div class="flex flex-wrap items-center gap-4 text-sm text-[#8a7d6b] mb-8 pb-8 border-b border-[#e8e0d4]">
+          <span v-if="article.categoryName" class="px-3 py-1 bg-[#f0e6d8] text-[#8b6f47] rounded-full">
+            {{ article.categoryName }}
+          </span>
+          <span>发布时间：{{ formatDate(article.publishTime || article.createTime) }}</span>
+          <span v-if="article.author">作者：{{ article.author }}</span>
+        </div>
+
+        <div v-if="article.image || article.cover" class="aspect-video bg-[#f3ebde] rounded-3xl overflow-hidden mb-10">
+          <img
+            :src="fileUrl(article.image || article.cover)"
+            :alt="article.title"
+            class="w-full h-full object-cover"
+          >
+        </div>
+
+        <RichText :content="article.content" />
+        <PageAttachments
+          v-if="article?.files?.length"
+          :attachments="article.files"
+        />
+      </div>
+
+      <div v-else class="text-center py-20">
+        <h1 class="text-2xl font-bold text-[#4a3f35] mb-4">文章不存在或已下架</h1>
+        <NuxtLink :to="`/article${article?.navigationId ? '?navId=' + article.navigationId : ''}`" class="text-[#8b6f47] hover:underline">返回新闻列表</NuxtLink>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import dayjs from 'dayjs'
+import type { Article } from '~/types'
+
+/**
+ * 模板 3 - 新闻详情页（暖米轻商风）
+ */
+const route = useRoute()
+const id = route.params.id as string
+const { fileUrl } = useFileUrl()
+
+const { data: article } = await useFetch<Article | null>(`/api/article/detail?id=${id}`, {
+  key: `article-${id}`
+})
+
+function formatDate(date?: string) {
+  if (!date) return ''
+  return dayjs(date).format('YYYY-MM-DD')
+}
+</script>