…Provider enum

Use official brand SVGs from Simple Icons and Keycloak branding repo
with proper brand colors instead of monochrome currentColor placeholders.

Resolved conflicts in composer.lock and SocialiteLoginTest.php:
- Regenerated composer.lock with new socialite provider packages
- Adopted Socialite::fake() pattern from main for Google tests
- Added provider config setup for enabled() checks in tests
- Converted Keycloak callback test from Mockery to Socialite::fake()

- Use abort_if() instead of if+abort() per AbortIfRector rule
- Configure provider credentials in PublicPagesTest social auth tests
  so enabled() check passes

# Conflicts:
#	app/Providers/AppServiceProvider.php
#	app/Providers/Filament/AppPanelProvider.php
#	composer.lock

# Conflicts:
#	app/Providers/Filament/AppPanelProvider.php
#	composer.lock

# Conflicts:
#	composer.lock