Major Update: Full File Sharing App with Auth + Cloud Storage

• Added user login & registration
• MongoDB (GridFS) integration
• Download link with file preview
• QR code sharing feature
• Fully responsive React frontend
• Upload history per user
• Improved security & CORS handling
• Deployed on Render + Vercel

Initial Basic Upload Release

• Simple upload form (no auth)
• File stored locally
• Share via download link
• No database or user tracking
• Minimal frontend