feat: 添加模型卡片分隔线，调整样式以优化布局

src/views/model/list/ModelCard.vue

@@ -129,6 +129,7 @@ async function confirmDelete(id: number | string) {
                 {{ item.createTime || '--' }}
               </span>
             </div>
+            <div class="card-divider" />
             <div class="card-footer">
               <span class="algo-pill">
                 {{ item.algorithm || '未知' }}
@@ -237,7 +238,7 @@ async function confirmDelete(id: number | string) {
   gap: 8px;
   align-items: center;
   justify-content: space-between;
-  margin-bottom: 12px;
+  margin-bottom: 8px;
   font-size: 12px;
   color: #6b7280;
 }
@@ -258,11 +259,17 @@ async function confirmDelete(id: number | string) {
   gap: 12px;
   align-items: center;
   justify-content: space-between;
-  padding-top: 10px;
+  padding-top: 6px;
   font-size: 13px;
   color: #4b5563;
 }
 
+.card-divider {
+  height: 1px;
+  margin: 4px 0 8px;
+  border-top: 1px dashed #e5e7eb;
+}
+
 .footer-text.strong {
   font-weight: 600;
 }