Fix Existing React/Firebase/Stripe Replit App for App Store Launch

I have an existing JavaScript/React web app built in Replit. It is one codebase with two app experiences: 1. FINYD Customer app for discovering providers, viewing profiles, booking appointments, messaging and social/content features. 2. FINYD Pro Business/provider app for managing profiles, bookings, employees, subscriptions, Stripe payments and creator collaborations. The app already exists and most features are already built. I do NOT need a rebuild and I do NOT need a redesign. I need an experienced developer to clean up the existing code, fix remaining bugs, remove the dependency on Replit as much as possible, and prepare the app for iOS/Android App Store release. Tasks: - Review the existing codebase - Fix bugs found in the existing code - Fix Google Login and Apple Login if possible - Check Firebase Auth configuration - Check Stripe Checkout/Billing flows - Check payment method setup - Check employee seat payment flow - Check mobile signup stability - Check domains finyd.de and finyd-pro.de - Make sure FINYD and FINYD Pro stay separated correctly inside one codebase - Move/export the code away from Replit dependency if possible - Prepare GitHub repository or clean handoff structure - Prepare the web app/PWA for iOS/Android wrapping - Check manifest, app icons, splash screen and mobile webview behavior - Prepare App Store / Google Play readiness checklist Deliverables: - Remaining critical bugs fixed - Code cleaned up enough for launch - App no longer fully dependent on Replit if possible - GitHub/export-ready project structure - App prepared for iOS/Android store release as much as possible - Clear list of any external settings I must configure myself - Short final handover report Important: Do not rebuild the app. Do not redesign the app. Do not remove existing working features. Do not increase scope without asking. Focus only on launch readiness, bug fixes, Replit independence and App Store preparation. Budget: Maximum 450 USD fixed price. Please do not apply if you cannot work within this budget.