Deploy Angular Application on Cloud

Hi, I have a working web application that manages a martial arts academy — built with Claude AI assistance. It's a single-file vanilla JavaScript app (no React/Next.js), about 9K lines, fully functional. Features include member management, attendance tracking, invoicing, rentals, product sales (POS), coach commissions, and weekly schedules. Current state: Runs offline as a static HTML/JS/CSS app Data is stored in browser localStorage Imports/exports Excel sheets (members, attendance, expenses, sales) Firebase integration code is already written but not yet connected to a live Firebase project What I need from you: Deploy the app online with a public URL (Firebase Hosting, Cloudflare Pages, or Netlify — your recommendation welcome) Set up the backend storage — either Firebase Firestore (preferred, code is already in place) OR another solution you recommend for ~3 users, ~500 members, light traffic Set up authentication so only authorized users can access the app (single shared admin login is fine for now) Migrate my existing localStorage data to the new backend (I can export it as JSON) Out of scope: No new features or UI changes. Just deploy what exists and connect the backend. What I'll provide: Full source code (ZIP) Existing data as JSON backup Firebase project access if you go that route Thanks!