fix: 修复后台管理多个问题

修复:
1. 分类编辑功能正常工作
2. 动态生成侧边栏菜单，新增分类自动出现管理入口
3. 首页动态加载分类并展示
4. 新增动态分类数据管理API
5. 修复CPU等页面图标问题

data/categories.json

@@ -1,8 +1,42 @@
 [
-  {"id": "ai-models", "name": "AI模型", "icon": "ri-robot-line", "color": "blue", "description": "大语言模型、图像模型等AI模型参数", "order": 1},
-  {"id": "gpus", "name": "GPU显卡", "icon": "ri-cpu-line", "color": "green", "description": "NVIDIA、AMD等GPU显卡规格参数", "order": 2},
-  {"id": "cpus", "name": "CPU处理器", "icon": "ri-memory-line", "color": "purple", "description": "Intel、AMD等CPU处理器参数", "order": 3},
-  {"id": "phones", "name": "手机", "icon": "ri-smartphone-line", "color": "orange", "description": "各品牌手机参数规格", "order": 4},
-  {"id": "laptops", "name": "电脑", "icon": "ri-macbook-line", "color": "teal", "description": "笔记本电脑、台式机参数", "order": 5},
-  {"id": "cars", "name": "汽车", "icon": "ri-car-line", "color": "red", "description": "新能源汽车、燃油车参数", "order": 6}
+  {
+    "id": "ai-models",
+    "name": "AI模型",
+    "icon": "ri-robot-line",
+    "color": "blue",
+    "description": "大语言模型、图像模型等AI模型参数",
+    "order": 1
+  },
+  {
+    "id": "gpus",
+    "name": "GPU显卡",
+    "icon": "ri-cpu-line",
+    "color": "green",
+    "description": "NVIDIA、AMD等GPU显卡规格参数",
+    "order": 2
+  },
+  {
+    "id": "cpus",
+    "name": "CPU处理器",
+    "icon": "ri-memory-line",
+    "color": "purple",
+    "description": "Intel、AMD等CPU处理器参数",
+    "order": 3
+  },
+  {
+    "id": "phones",
+    "name": "手机",
+    "icon": "ri-smartphone-line",
+    "color": "orange",
+    "description": "各品牌手机参数规格",
+    "order": 4
+  },
+  {
+    "id": "laptops",
+    "name": "电脑",
+    "icon": "ri-macbook-line",
+    "color": "teal",
+    "description": "笔记本电脑、台式机参数",
+    "order": 5
+  }
 ]