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.

templates/components/controls.html

@@ -46,6 +46,11 @@
                 </button>
             </div>
             {% endif %}
+            <div class="control-group">
+                <button id="findDuplicatesBtn" data-action="find-duplicates" title="Find duplicate models">
+                    <i class="fas fa-clone"></i> Duplicates
+                </button>
+            </div>
             <div class="control-group">
                 <button id="favoriteFilterBtn" data-action="toggle-favorites" class="favorite-filter" title="Show favorites only">
                     <i class="fas fa-star"></i> Favorites