fix: 动态分类子类别筛选修复

- 移除showDynamicCategory中的dynamicSubcategoryFilter重置
- 改为在侧边栏点击时重置筛选值
- 点击子类别按钮时保持筛选值不被重置
- 手机、电脑、汽车、摄像等动态分类现在可以正确筛选

templates/admin.html

@@ -666,7 +666,7 @@
                 } else {
                     // 动态分类
                     html += `
-                        <a href="#cat-${cat.id}" onclick="showDynamicCategory('${cat.id}')" class="sidebar-link flex items-center gap-2 px-3 py-2 rounded-lg text-gray-300" data-section="cat-${cat.id}">
+                        <a href="#cat-${cat.id}" onclick="dynamicSubcategoryFilter='';showDynamicCategory('${cat.id}')" class="sidebar-link flex items-center gap-2 px-3 py-2 rounded-lg text-gray-300" data-section="cat-${cat.id}">
                             <i class="${cat.icon}"></i>
                             <span>${cat.name}管理</span>
                         </a>
@@ -688,7 +688,8 @@
         // 显示动态分类数据
         async function showDynamicCategory(categoryId) {
             dynamicCategoryId = categoryId;
-            dynamicSubcategoryFilter = '';
+            // 不要每次都重置筛选值，除非是新切换的分类
+            // dynamicSubcategoryFilter = '';  // 移除这行
             const cat = categories.find(c => c.id === categoryId);
             const fields = cat ? (cat.fields || []) : [];
             const fixedFields = ['id', 'created_at', 'updated_at', 'visible', 'raw_text', 'category_id', 'subcategory_id', 'is_pinned', 'images'];