Add proxy downloads and bulk file operations

- Implement proxy download endpoint for better mobile Safari compatibility
- Add bulk selection with checkboxes in file browser
- Add bulk actions bar for downloading/deleting selected files
- Replace direct S3 downloads with server-proxied downloads
- Fix download issues on mobile devices by using proper link handling

server/api/files/proxy-download.ts

@@ -0,0 +1,56 @@
+import { getDownloadUrl } from '~/server/utils/minio';
+
+export default defineEventHandler(async (event) => {
+  try {
+    const query = getQuery(event);
+    const fileName = query.fileName as string;
+    
+    if (!fileName) {
+      throw createError({
+        statusCode: 400,
+        statusMessage: 'File name is required',
+      });
+    }
+    
+    // Get the download URL from MinIO
+    const url = await getDownloadUrl(fileName);
+    
+    // Fetch the file from MinIO
+    const response = await fetch(url);
+    
+    if (!response.ok) {
+      throw createError({
+        statusCode: response.status,
+        statusMessage: 'Failed to fetch file from storage',
+      });
+    }
+    
+    // Get the file data
+    const arrayBuffer = await response.arrayBuffer();
+    const buffer = Buffer.from(arrayBuffer);
+    
+    // Extract clean filename (remove timestamp prefix)
+    let cleanFileName = fileName.split('/').pop() || fileName;
+    const timestampMatch = cleanFileName.match(/^\d{10,}-(.+)$/);
+    if (timestampMatch) {
+      cleanFileName = timestampMatch[1];
+    }
+    
+    // Get content type
+    const contentType = response.headers.get('content-type') || 'application/octet-stream';
+    
+    // Set headers for download
+    setHeader(event, 'Content-Type', contentType);
+    setHeader(event, 'Content-Disposition', `attachment; filename="${cleanFileName}"`);
+    // Content-Length header is set automatically by Nitro when returning a buffer
+    
+    // Return the file buffer
+    return buffer;
+  } catch (error: any) {
+    console.error('Failed to proxy download:', error);
+    throw createError({
+      statusCode: 500,
+      statusMessage: error.message || 'Failed to download file',
+    });
+  }
+});