feat: add file deduplication and hash checking for uploads

- Implemented SHA-256 hashing for uploaded files to enable deduplication.
- Added CheckHash method to verify if a file with the same hash already exists.
- Updated Upload method to reuse existing media assets if a duplicate is found.
- Introduced a new hash column in the media_assets table to store file hashes.
- Enhanced the upload process to include progress tracking and hash calculation.
- Modified frontend to check for existing files before uploading and to show upload progress.
- Added vuedraggable for drag-and-drop functionality in the content editing view.

frontend/portal/src/api/common.js

@@ -2,10 +2,49 @@ import { request } from '../utils/request';
 
 export const commonApi = {
     getOptions: () => request('/common/options'),
+    checkHash: (hash) => request(`/upload/check?hash=${hash}`),
     upload: (file, type) => {
         const formData = new FormData();
         formData.append('file', file);
         formData.append('type', type);
         return request('/upload', { method: 'POST', body: formData });
     },
+    uploadWithProgress: (file, type, onProgress) => {
+        return new Promise((resolve, reject) => {
+            const formData = new FormData();
+            formData.append('file', file);
+            formData.append('type', type);
+
+            const xhr = new XMLHttpRequest();
+            xhr.open('POST', '/v1/upload');
+
+            const token = localStorage.getItem('token');
+            if (token) {
+                xhr.setRequestHeader('Authorization', `Bearer ${token}`);
+            }
+
+            xhr.upload.onprogress = (event) => {
+                if (event.lengthComputable && onProgress) {
+                    const percentComplete = (event.loaded / event.total) * 100;
+                    onProgress(percentComplete);
+                }
+            };
+
+            xhr.onload = () => {
+                if (xhr.status >= 200 && xhr.status < 300) {
+                    try {
+                        const response = JSON.parse(xhr.responseText);
+                        resolve(response);
+                    } catch (e) {
+                        reject(e);
+                    }
+                } else {
+                    reject(new Error(xhr.statusText || 'Upload failed'));
+                }
+            };
+
+            xhr.onerror = () => reject(new Error('Network Error'));
+            xhr.send(formData);
+        });
+    }
 };