feat(payment): implement beautiful payment confirmation page with real-time status checking

- Add PaymentSuccessController with authentication and subscription selection logic
   - Create PaymentConfirmation Livewire component with polling mechanism
   - Implement real-time subscription status verification via Polar provider API
   - Add confetti animation for successful payment confirmation
   - Design responsive payment success page with dark mode support
   - Fix Polar provider field mapping (updated_at -> modified_at)
   - Add comprehensive error handling and logging
   - Support multiple subscription status states (verifying, activated, pending, error)
   - Implement automatic polling with 30-second intervals (max 5 attempts)
   - Add fallback redirects and user-friendly status messages

routes/payment.php

@@ -2,6 +2,7 @@
 
 use App\Http\Controllers\PaymentController;
 use App\Http\Controllers\PaymentProviderController;
+use App\Http\Controllers\PaymentSuccessController;
 use App\Http\Controllers\WebhookController;
 use Illuminate\Support\Facades\Route;
 
@@ -12,7 +13,9 @@ use Illuminate\Support\Facades\Route;
 */
 
 Route::prefix('payment')->name('payment.')->group(function () {
-    Route::get('/success', [PaymentController::class, 'success'])->name('success');
+    Route::get('/success', [PaymentSuccessController::class, 'show'])
+        ->middleware(['auth', 'verified'])
+        ->name('success');
     Route::get('/cancel', [PaymentController::class, 'cancel'])->name('cancel');
 
     // UNIFIED: Payment processing endpoints (new unified payment system)