feat: 支持子类别配置和关键特性显示

- 类别数据结构新增 subcategories 字段
- 每个子类别可定义 key_features 和 feature_labels
- 前端模型页面添加子类别选择器
- 表格根据子类别动态显示关键特性列
- 后台管理支持编辑子类别配置（JSON格式）
- 预设了各类别的子类别配置（对话、代码、推理、视觉等）

templates/admin.html

@@ -922,6 +922,13 @@
                     else if (key === 'images') {
                         try { data[key] = JSON.parse(value); } catch { data[key] = []; }
                     }
+                    else if (key === 'subcategories') {
+                        // 解析子类别JSON
+                        try { data[key] = JSON.parse(value); } catch { 
+                            alert('子类别JSON格式错误，请检查格式');
+                            return;
+                        }
+                    }
                     else data[key] = value;
                 }
             });
@@ -1096,6 +1103,9 @@
 
         // 表单模板
         function getCategoryForm(data = {}) {
+            const subcategories = data.subcategories || [];
+            const subcategoriesJson = JSON.stringify(subcategories, null, 2);
+            
             return `<form id="itemForm" class="space-y-4">
                 <div class="grid grid-cols-2 gap-4">
                     <div><label class="text-sm text-gray-600 mb-1 block">ID *</label><input type="text" name="id" value="${data.id || ''}" ${data.id ? 'readonly' : ''} required class="w-full px-3 py-2 border rounded-lg ${data.id ? 'bg-gray-100' : ''}"></div>
@@ -1116,6 +1126,24 @@
                     </select></div>
                 </div>
                 <div><label class="text-sm text-gray-600 mb-1 block">描述</label><textarea name="description" rows="2" class="w-full px-3 py-2 border rounded-lg">${data.description || ''}</textarea></div>
+                
+                <!-- 子类别配置 -->
+                <div class="border-t pt-4">
+                    <label class="text-sm text-gray-600 mb-2 block"><i class="ri-folder-line mr-1"></i>子类别配置（JSON格式）</label>
+                    <div class="bg-blue-50 rounded-lg p-3 mb-2 text-xs text-blue-700">
+                        <p class="mb-2">子类别配置示例：</p>
+                        <pre class="bg-blue-100 p-2 rounded overflow-x-auto">[
+  {
+    "id": "chat",
+    "name": "对话模型",
+    "icon": "ri-chat-3-line",
+    "key_features": ["context_length", "mmlu"],
+    "feature_labels": {"context_length": "上下文", "mmlu": "MMLU"}
+  }
+]</pre>
+                    </div>
+                    <textarea name="subcategories" rows="8" class="w-full px-3 py-2 border rounded-lg font-mono text-sm" placeholder='[]'>${subcategoriesJson}</textarea>
+                </div>
             </form>`;
         }