Fix 40+ codebase issues: security, performance, duplication, dead code, and routes

HIGH:
- Add missing import RadioSongRequestFormRequest (fixes crash on POST)
- Add Purify XSS sanitization for article full_story
- Fix duplicate radio API routes (/api/radio vs /api/radio/v2)
- Add try-catch guards in InstallationController for missing records

MEDIUM:
- Fix N+1: eager load comments.user in ArticleController::show()
- Fix GuestbookController authorization logic
- Remove dead doSetup() method and duplicate route
- Extract shared HasRadioDefaults trait (remove code duplication)
- Use named routes in ForceStaffTwoFactorMiddleware
- Fix WebsiteHelpCenterTicket::isOpen() (no permission leak)
- Enable  on WebsiteHelpCenterTicket (matches schema)
- Replace WebsiteTeam::all()->pluck() with direct pluck()
- Replace CatalogPage::all()->pluck() with direct pluck()
- Replace WebsiteBadge::all() with direct pluck()
- Add throttle middleware to guestbook store, logo-generator, radio embed

LOW:
- Remove unused imports
- Remove dead /inertia-test route
- Consolidate cache keys in RadioController

app/Http/Controllers/Admin/RadioWizardController.php

@@ -3,8 +3,6 @@
 namespace App\Http\Controllers\Admin;
 
 use App\Http\Controllers\Controller;
-use App\Models\Miscellaneous\WebsiteSetting;
-use App\Models\RadioRank;
 use App\Services\Community\RadioStreamService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\RedirectResponse;
@@ -14,6 +12,8 @@ use Illuminate\View\View;
 
 class RadioWizardController extends Controller
 {
+    use \App\Http\Controllers\Concerns\HasRadioDefaults;
+
     private const SESSION_KEY = 'radio_wizard';
 
     public function __construct(
@@ -349,30 +349,7 @@ class RadioWizardController extends Controller
             $settings['radio_discord_song_changes'] = '1';
         }
 
-        foreach ($settings as $key => $value) {
-            WebsiteSetting::updateOrCreate(
-                ['key' => $key],
-                ['value' => (string) $value, 'comment' => 'Radio wizard configuratie'],
-            );
-        }
-    }
-
-    private function createDefaultRanks(): void
-    {
-        $ranks = [
-            ['name' => 'Trainee DJ', 'level' => 1, 'is_active' => true, 'description' => 'Beginnende DJ'],
-            ['name' => 'Junior DJ', 'level' => 2, 'is_active' => true, 'description' => 'Ervaren DJ'],
-            ['name' => 'Senior DJ', 'level' => 3, 'is_active' => true, 'description' => 'Professionele DJ'],
-            ['name' => 'Head DJ', 'level' => 4, 'is_active' => true, 'description' => 'Hoofd DJ'],
-            ['name' => 'Radio Manager', 'level' => 5, 'is_active' => true, 'description' => 'Radio Manager'],
-        ];
-
-        foreach ($ranks as $rank) {
-            RadioRank::updateOrCreate(
-                ['name' => $rank['name']],
-                $rank,
-            );
-        }
+        $this->saveRadioSettings($settings);
     }
 
     private function buildSettingsList(array $data): array