Native Service Worker Support for PWA/Offline Functionality

Currently, Base44 apps cannot deploy static Service Worker files (sw.js) 
at the application root level, which limits full Progressive Web App (PWA) 
and offline functionality implementation.

CURRENT LIMITATIONS:
- No public/ directory or root-level static file access
- Service Workers must be served via blob URLs or backend functions
- This creates reliability and scope issues for offline-first apps

REQUESTED FEATURE:
Enable developers to:
1. Place a sw.js file at the root level of published apps
2. Configure Service Worker settings through app dashboard
3. Have Base44 automatically serve SW with proper headers and scope

USE CASE:
Building file management apps (like Crate Drive) that need offline 
functionality for users to access cached files without internet connection.

CURRENT WORKAROUND:
Using backend functions to serve Service Worker code, which adds complexity 
and isn't the industry-standard approach.

This would enable Base44 apps to be true Progressive Web Apps with full 
offline support out of the box.