Add multi-step radio wizard with Shoutcast/Icecast/AzureCast support and multi-language translations

- New 5-step RadioWizardController with session-based wizard flow
- Enhanced RadioStreamService with Shoutcast/Icecast/ AzureCast auto-detection
- Connection test functionality for stream, now-playing, and listeners
- Wizard views for all 5 steps with step indicator navigation
- All 21 language files updated with wizard translation keys (NL/EN + placeholders)
- Wizard link added to existing radio setup page
- Routes registered under /admin/radio/wizard/*

resources/views/admin/radio/setup.blade.php

@@ -356,6 +356,11 @@
                 </button>
             </form>
 
+            <a href="{{ route('admin.radio.wizard') }}" class="btn-primary" style="text-decoration: none;">
+                <span>🎯</span>
+                {{ __('radio.open_wizard') }}
+            </a>
+
             <a href="/housekeeping/radio-settings" class="btn-secondary">
                 <span>⚙️</span>
                 {{ __('radio.go_to_radio_settings') }}