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.

templates/components/modals.html

@@ -571,4 +571,34 @@
             </div>
         </div>
     </div>
+</div>
+
+<!-- Re-link to Civitai Modal -->
+<div id="relinkCivitaiModal" class="modal">
+    <div class="modal-content">
+        <button class="close" onclick="modalManager.closeModal('relinkCivitaiModal')">&times;</button>
+        <h2>Re-link to Civitai</h2>
+        <div class="warning-box">
+            <i class="fas fa-exclamation-triangle"></i>
+            <p><strong>Warning:</strong> This is a potentially destructive operation. Re-linking will:</p>
+            <ul>
+                <li>Override existing metadata</li>
+                <li>Potentially modify the model hash</li>
+                <li>May have other unintended consequences</li>
+            </ul>
+            <p>Only proceed if you're sure this is what you want.</p>
+        </div>
+        <div class="input-group">
+            <label for="civitaiModelUrl">Civitai Model URL:</label>
+            <input type="text" id="civitaiModelUrl" placeholder="https://civitai.com/models/1098030?modelVersionId=1233411" />
+            <div class="input-error" id="civitaiModelUrlError"></div>
+            <div class="input-help">
+                The URL must include the modelVersionId parameter.
+            </div>
+        </div>
+        <div class="modal-actions">
+            <button class="cancel-btn" onclick="modalManager.closeModal('relinkCivitaiModal')">Cancel</button>
+            <button class="confirm-btn" id="confirmRelinkBtn">Confirm Re-link</button>
+        </div>
+    </div>
 </div>