Add bulk delete functionality for loras and implement model duplicates management. See #198

- Introduced a new API endpoint for bulk deleting loras.
- Added ModelDuplicatesManager to handle duplicate models for loras and checkpoints.
- Implemented UI components for displaying duplicates and managing selections.
- Enhanced controls with a button for finding duplicates.
- Updated templates to include a duplicates banner and associated actions.

static/js/utils/VirtualScroller.js

@@ -87,6 +87,11 @@ export class VirtualScroller {
     }
 
     calculateLayout() {
+        const pageState = getCurrentPageState();
+        if (pageState.duplicatesMode) {
+            return false
+        }
+
         // Get container width and style information
         const containerWidth = this.containerElement.clientWidth;
         const containerStyle = getComputedStyle(this.containerElement);