feat: implement direct file upload for sends with JWT token validation

- Added `processSendFileUpload` function to handle file uploads for sends.
- Integrated JWT token creation and verification for secure file uploads.
- Updated `handleCreateFileSendV2` and `handleGetSendFileUpload` to use new upload URL generation.
- Refactored upload handling in `handleUploadSendFile` and `handlePublicUploadSendFile` to utilize the new upload process.
- Introduced `uploadDirectEncryptedPayload` for handling direct uploads with progress tracking.
- Enhanced API routes to support both POST and PUT methods for attachment uploads.
- Added localization strings for upload progress messages.
- Created utility functions for direct upload URL building and payload parsing.

src/router-authenticated.ts

@@ -165,7 +165,7 @@ export async function handleAuthenticatedRoute(
     const attachmentMatch = subPath.match(/^\/attachment\/([a-f0-9-]+)$/i);
     if (attachmentMatch) {
       const attachmentId = attachmentMatch[1];
-      if (method === 'POST') return handleUploadAttachment(request, env, userId, cipherId, attachmentId);
+      if (method === 'POST' || method === 'PUT') return handleUploadAttachment(request, env, userId, cipherId, attachmentId);
       if (method === 'GET') return handleGetAttachment(request, env, userId, cipherId, attachmentId);
       if (method === 'DELETE') return handleDeleteAttachment(request, env, userId, cipherId, attachmentId);
     }