feat: 重构导航和博客系统，支持多级菜单和API数据源

- 重构导航菜单支持多级子菜单结构
- 博客系统改为从API获取数据，移除本地文件存储
- 删除旧的关于页面，准备重构
- 修复博客详情页slug匹配问题
- 默认首页重定向到中文版本

i18n/messages/zh.json

@@ -13,7 +13,33 @@
       },
       {
         "name": "走进福安德",
-        "href": "/about"
+        "href": "/about",
+        "children": [
+          {
+            "name": "公司简介",
+            "href": "/about?section=company"
+          },
+          {
+            "name": "企业文化",
+            "href": "/about?section=culture"
+          },
+          {
+            "name": "生产基地",
+            "href": "/about?section=base"
+          },
+          {
+            "name": "组织架构",
+            "href": "/about?section=organization"
+          },
+          {
+            "name": "荣誉资质",
+            "href": "/about?section=awards"
+          },
+          {
+            "name": "发展历程",
+            "href": "/about?section=history"
+          }
+        ]
       },
       {
         "name": "产品中心",
@@ -21,7 +47,21 @@
       },
       {
         "name": "新闻中心",
-        "href": "/blog"
+        "href": "/blog",
+        "children": [
+          {
+            "name": "公告",
+            "href": "/blog?category=announce"
+          },
+          {
+            "name": "新闻",
+            "href": "/blog?category=news"
+          },
+          {
+            "name": "活动",
+            "href": "/blog?category=event"
+          }
+        ]
       }
     ]
   },
@@ -35,32 +75,32 @@
           "title": "关于我们",
           "links": [
             {
-              "href": "/about?section=company",
+              "href": "/zh/about?section=company",
               "name": "公司简介",
               "useA": true
             },
             {
-              "href": "/about?section=culture",
+              "href": "/zh/about?section=culture",
               "name": "企业文化",
               "useA": true
             },
             {
-              "href": "/about?section=base",
+              "href": "/zh/about?section=base",
               "name": "生产基地",
               "useA": true
             },
             {
-              "href": "/about?section=organization",
+              "href": "/zh/about?section=organization",
               "name": "组织架构",
               "useA": true
             },
             {
-              "href": "/about?section=awards",
+              "href": "/zh/about?section=awards",
               "name": "荣誉资质",
               "useA": true
             },
             {
-              "href": "/about?section=history",
+              "href": "/zh/about?section=history",
               "name": "发展历程",
               "useA": true
             }