feat: Add web interface with local and cloud deployment options

[juansilvadesign]

Overview

This PR adds a complete web-based interface for downloading Loom videos, eliminating the need for command-line usage. Users can now download videos through a modern, user-friendly UI.

Features Added

• 🌐 Web UI: Beautiful, responsive interface at /server/public/index.html
• 📥 Automatic Downloads: Videos automatically download to user's Downloads folder after processing
• 🖥️ Local Development: Run the server locally with npm start in the /server directory
• ☁️ Cloud Deployment: Complete guide for deploying to Render's free tier
• 🔒 Security: File download endpoint with protection against directory traversal attacks
• 🧹 Cleanup: Automatic deletion of temporary files after download

Changes

• Added Express.js server in /server/server.js
• Added responsive web UI with real-time feedback
• Integrated video download functionality with automatic browser downloads
• Added comprehensive deployment documentation in README

How to Use

Local

cd server
npm install
npm start
# Visit http://localhost:3000