Support custom Android package names and iOS bundle IDs

Base44 should allow users to set custom Android package names and iOS bundle identifiers for app store publishing, such as:

com.companyname.appname

instead of forcing the auto-generated format:

com.base[APP-ID].app

This is important for production apps and serious businesses because the package name/bundle ID becomes part of the app’s long-term identity.

Benefits:

1. Better brand ownership.

2. Cleaner Google Play and App Store publishing.

3. Easier app migration if users move outside Base44 later.

4. Better alignment with company domains and developer accounts.

5. Reduced confusion during verification and compliance checks.

6. More professional app store setup for businesses publishing multiple apps.

This is important for users who want to publish real production apps through Base44, not only test apps or MVPs.