feat(app.js, i18n, index.html, styles.css): implement pagination for auth file management

- Added pagination controls to the auth file list in the UI, allowing users to navigate through large sets of files.
- Enhanced the rendering logic to support pagination, including updating the current page and total pages dynamically.
- Updated internationalization strings for pagination in both English and Chinese.
- Introduced new styles for pagination controls to improve user experience and accessibility.

styles.css

@@ -1567,6 +1567,33 @@ input:checked+.slider:before {
     gap: 15px;
 }
 
+.pagination-controls {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 12px;
+    margin-top: 20px;
+    flex-wrap: wrap;
+}
+
+.pagination-btn {
+    gap: 6px;
+    min-width: 120px;
+    justify-content: center;
+    display: inline-flex;
+    align-items: center;
+}
+
+.pagination-btn:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+}
+
+.pagination-info {
+    font-size: 0.95rem;
+    color: var(--text-secondary);
+}
+
 /* 响应式：中等屏幕2列 */
 @media (max-width: 1400px) {
     .file-grid {