I have an app built on Lovable.dev and I need help with a few fixes and deployment: 1- Subdomains & Custom Domains Configuration The app is a marketplace. I want each vendor to automatically get a subdomain on signup (e.g., vendorname.app.com). Each vendor should also be able to connect their own custom domain (e.g., www.vendorname.com). This setup should be automated as much as possible, including smooth DNS configuration and SSL (HTTPS) handling for both vendor subdomains and custom domains. 2- Authentication (Login/Signup) Make sure login and signup are fully functional. Enable social login options, specifically Google and Facebook. 3- Multilingual Support / Language Switching Right now, when I change the language (either from the frontend or from the dashboard), only a few sections actually change. I want the language switcher to work globally, so that all sections of the app change language correctly. 4- Deployment Setup Deploy the app from Lovable to a production-ready platform (Netlify, Vercel, Railway, or any better recommendation you may have). I am still making edits inside Lovable, so the ideal setup should be: Lovable ➜ GitHub ➜ Hosting platform (CI/CD) Please configure a proper CI/CD workflow so that changes pushed from Lovable to GitHub can automatically deploy to the chosen hosting provider.