feat(pages): 添加页面详情页和产品详情页路由

- 实现页面详情页功能，支持通过ID动态加载CMS导航内容
- 添加页面标题和内容渲染逻辑，支持多种内容字段候选
- 集成SEO优化，自动设置页面标题、描述和路径信息
- 实现错误处理机制，包括加载失败和页面不存在的情况
- 添加重试和返回首页的功能按钮
- 创建产品详情页基础路由结构（占位文件）

app/pages/page/[id].vue

@@ -0,0 +1,124 @@
+<template>
+  <div class="mx-auto max-w-screen-md px-4 py-12">
+    <a-spin v-if="pending" />
+
+    <a-result
+      v-else-if="loadError"
+      status="error"
+      title="页面加载失败"
+      :sub-title="loadError.message"
+    >
+      <template #extra>
+        <a-space>
+          <a-button type="primary" @click="refresh()">重试</a-button>
+          <a-button @click="navigateTo('/')">返回首页</a-button>
+        </a-space>
+      </template>
+    </a-result>
+
+    <a-result
+      v-else-if="!navigation"
+      status="404"
+      title="页面不存在"
+      sub-title="未找到对应的页面内容。"
+    >
+      <template #extra>
+        <a-space>
+          <a-button type="primary" @click="navigateTo('/')">返回首页</a-button>
+        </a-space>
+      </template>
+    </a-result>
+
+    <template v-else>
+      <a-typography-title :level="1" class="!mb-6">{{ pageTitle }}</a-typography-title>
+      <a-alert v-if="!pageContent" class="mb-6" type="info" show-icon message="暂无内容" />
+      <RichText v-else :content="pageContent" />
+    </template>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { getCmsNavigation } from '@/api/cms/cmsNavigation'
+import type { CmsNavigation } from '@/api/cms/cmsNavigation/model'
+import { usePageSeo } from '@/composables/usePageSeo'
+
+const route = useRoute()
+
+const id = computed(() => {
+  const raw = route.params.id
+  const text = Array.isArray(raw) ? raw[0] : raw
+  const n = Number(text)
+  return Number.isFinite(n) ? n : NaN
+})
+
+const {
+  data: navigation,
+  pending,
+  error: loadError,
+  refresh
+} = await useAsyncData<CmsNavigation | null>(
+  () => `cms-navigation-${String(route.params.id)}`,
+  async () => {
+    if (!Number.isFinite(id.value)) return null
+    return await getCmsNavigation(id.value)
+  },
+  { watch: [id] }
+)
+
+function pickString(obj: Record<string, unknown>, key: string) {
+  const v = obj[key]
+  return typeof v === 'string' ? v.trim() : ''
+}
+
+function coerceContent(value: unknown): string {
+  if (typeof value === 'string') return value
+  if (value && typeof value === 'object') {
+    try {
+      return JSON.stringify(value)
+    } catch {
+      return String(value)
+    }
+  }
+  return ''
+}
+
+const pageTitle = computed(() => {
+  const nav = navigation.value as unknown as Record<string, unknown> | null
+  if (!nav) return '页面'
+  return pickString(nav, 'title') || pickString(nav, 'label') || `页面 ${String(route.params.id)}`
+})
+
+const pageContent = computed(() => {
+  const nav = navigation.value as unknown as Record<string, unknown> | null
+  if (!nav) return ''
+
+  // Different CMS deployments may store content under different keys.
+  const candidates = [
+    'content',
+    'html',
+    'body',
+    'text',
+    'pageContent',
+    'articleContent',
+    'suffix',
+    'comments',
+    'meta',
+    'style'
+  ]
+
+  for (const k of candidates) {
+    const val = nav[k]
+    const text = coerceContent(val).trim()
+    if (text) return text
+  }
+
+  return ''
+})
+
+usePageSeo({
+  title: pageTitle.value,
+  description: pageContent.value ? pageContent.value.slice(0, 120) : `${pageTitle.value} - 页面内容`,
+  path: route.path
+})
+</script>
+