fix: 修复子类别筛选按钮点击无效问题

- 用containerId判断currentFilter，而非categoryId
- 用previousElementSibling找全部按钮，而非parent.querySelector
- 确保点击子类别后样式正确切换
- 全部按钮和子类别按钮互斥选中状态

templates/admin.html

@@ -534,11 +534,30 @@
                 container.innerHTML = '';
                 return;
             }
+            
+            // 获取当前筛选值 - 根据容器ID判断
+            let currentFilter = '';
+            if (containerId === 'model-subcategory-filters') currentFilter = modelSubcategoryFilter;
+            else if (containerId === 'gpu-subcategory-filters') currentFilter = gpuSubcategoryFilter;
+            else if (containerId === 'cpu-subcategory-filters') currentFilter = cpuSubcategoryFilter;
+            else if (containerId === 'dynamic-subcategory-filters') currentFilter = dynamicSubcategoryFilter;
+            
+            // 渲染子类别按钮
             container.innerHTML = cat.subcategories.map(sub => `
-                <button onclick="${filterFunction}('${sub.id}')" class="px-3 py-1 rounded text-sm bg-white border text-gray-600 hover:bg-gray-100">
-                    <i class="${sub.icon} mr-1"></i>${sub.name}
+                <button onclick="${filterFunction}('${sub.id}')" class="px-3 py-1 rounded text-sm ${currentFilter === sub.id ? 'bg-indigo-600 text-white' : 'bg-white border text-gray-600 hover:bg-gray-100'}">
+                    <i class="${sub.icon || 'ri-folder-line'} mr-1"></i>${sub.name}
                 </button>
             `).join('');
+            
+            // 更新"全部"按钮的样式 - 它是容器前面的那个按钮
+            const allBtn = container.previousElementSibling;
+            if (allBtn && allBtn.tagName === 'BUTTON') {
+                if (currentFilter === '') {
+                    allBtn.className = 'px-3 py-1 rounded text-sm bg-indigo-600 text-white';
+                } else {
+                    allBtn.className = 'px-3 py-1 rounded text-sm bg-white border text-gray-600 hover:bg-gray-100';
+                }
+            }
         }
 
         const colorMap = {