feat: refactor model API structure to support specific model types with dedicated API clients for Checkpoints, LoRAs, and Embeddings

refactor: consolidate model API client creation into a factory function for better maintainability
feat: implement move operations for LoRAs and handle unsupported operations for Checkpoints and Embeddings

static/js/api/checkpointApi.js

@@ -0,0 +1,47 @@
+import { BaseModelApiClient } from './baseModelApi.js';
+import { showToast } from '../utils/uiHelpers.js';
+
+/**
+ * Checkpoint-specific API client
+ */
+export class CheckpointApiClient extends BaseModelApiClient {
+    /**
+     * Checkpoints don't support move operations
+     */
+    async moveSingleModel(filePath, targetPath) {
+        showToast('Moving checkpoints is not supported', 'warning');
+        return null;
+    }
+
+    /**
+     * Checkpoints don't support bulk move operations
+     */
+    async moveBulkModels(filePaths, targetPath) {
+        showToast('Moving checkpoints is not supported', 'warning');
+        return [];
+    }
+
+    /**
+     * Get checkpoint information
+     */
+    async getCheckpointInfo(filePath) {
+        try {
+            const response = await fetch(this.apiConfig.endpoints.specific.info, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json'
+                },
+                body: JSON.stringify({ file_path: filePath })
+            });
+            
+            if (!response.ok) {
+                throw new Error('Failed to fetch checkpoint info');
+            }
+            
+            return await response.json();
+        } catch (error) {
+            console.error('Error fetching checkpoint info:', error);
+            throw error;
+        }
+    }
+}