feat: 扩展 Model 设置功能

- 添加 Embedding 模型类型支持
- 优化模型设置表单样式

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/views/Settings.vue

@@ -476,7 +476,7 @@ const saveStorageSettings = () => {
                   {{ model.model }}
                 </td>
                 <td class="text-center">
-                  <span class="model-type-tag">{{ model.model_type }}</span>
+                  <span class="model-type-tag" :class="model.model_type">{{ model.model_type }}</span>
                 </td>
                 <td class="text-center text-sm">
                   {{ model.base_url }}