Add CivitAI re-linking functionality and related UI components. Fixes #216

- Implemented new API endpoints for re-linking models to CivitAI.
- Added context menu options for re-linking in both Lora and Checkpoint context menus.
- Created a modal for user confirmation and input for CivitAI model URL.
- Updated styles for the new modal and context menu items.
- Enhanced error handling and user feedback during the re-linking process.

static/css/components/bulk.css

@@ -274,83 +274,6 @@
     background: var(--lora-accent);
 }
 
-/* NSFW Level Selector */
-.nsfw-level-selector {
-    position: fixed;
-    top: 50%;
-    left: 50%;
-    transform: translate(-50%, -50%);
-    background: var(--card-bg);
-    border: 1px solid var(--border-color);
-    border-radius: var(--border-radius-base);
-    padding: 16px;
-    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
-    z-index: var(--z-modal);
-    width: 300px;
-    display: none;
-}
-
-.nsfw-level-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    margin-bottom: 16px;
-}
-
-.nsfw-level-header h3 {
-    margin: 0;
-    font-size: 16px;
-    font-weight: 500;
-}
-
-.close-nsfw-selector {
-    background: transparent;
-    border: none;
-    color: var(--text-color);
-    cursor: pointer;
-    padding: 4px;
-    border-radius: var(--border-radius-xs);
-}
-
-.close-nsfw-selector:hover {
-    background: var(--border-color);
-}
-
-.current-level {
-    margin-bottom: 12px;
-    padding: 8px;
-    background: var(--bg-color);
-    border-radius: var(--border-radius-xs);
-    border: 1px solid var(--border-color);
-}
-
-.nsfw-level-options {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 8px;
-}
-
-.nsfw-level-btn {
-    flex: 1 0 calc(33% - 8px);
-    padding: 8px;
-    border-radius: var(--border-radius-xs);
-    background: var(--bg-color);
-    border: 1px solid var(--border-color);
-    color: var(--text-color);
-    cursor: pointer;
-    transition: all 0.2s ease;
-}
-
-.nsfw-level-btn:hover {
-    background: var(--lora-border);
-}
-
-.nsfw-level-btn.active {
-    background: var(--lora-accent);
-    color: white;
-    border-color: var(--lora-accent);
-}
-
 /* Mobile optimizations */
 @media (max-width: 768px) {
     .selected-thumbnails-strip {