✨ feat: polish “Missing Models” UX & mobile actions layout

Overview
• Re-designed `MissingModelsModal` to align with `ModelTestModal` and deliver a cleaner, paginated experience.
• Improved mobile responsiveness for action buttons in `ModelsActions`.

Details
1. MissingModelsModal.jsx
   • Switched from `List` to `Table` for a more structured view.
   • Added search bar with live keyword filtering and clear icon.
   • Implemented pagination via `MODEL_TABLE_PAGE_SIZE`; auto-resets on search.
   • Dynamic rendering: when no data, show unified Empty state without column header.
   • Enhanced header layout with total-count subtitle and modal corner rounding.
   • Removed unused `Typography.Text` import.

2. ModelsActions.jsx
   • Set “Delete Selected Models” and “Missing Models” buttons to `flex-1 md:flex-initial`, placing them on the same row as “Add Model” on small screens.

Result
The “Missing Models” workflow now offers quicker discovery, a familiar table interface, and full mobile friendliness—without altering API behavior.

web/src/components/table/models/ModelsColumnDefs.js

@@ -201,6 +201,11 @@ export const getModelsColumns = ({
     {
       title: t('模型名称'),
       dataIndex: 'model_name',
+      render: (text) => (
+        <Text copyable onClick={(e) => e.stopPropagation()}>
+          {text}
+        </Text>
+      ),
     },
     {
       title: t('描述'),