fix: resolve permission toggle persistence, nudge terminology, and bulk action bugs (Bugs #2-5)

- Fix togglePermission() to always include all permission keys with false defaults
- Add migration to backfill null/empty Manager permissions with config defaults
- Rename nudge UI text from "Relance" to "Notification"/"Notifier" across 8 files
- Fix select-all checkbox and show checkboxes on all declaration rows
- Remove en_attente_client status restriction from BulkNotificationController

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/Notifications/DeclarationMentionNotification.php

@@ -2,6 +2,7 @@
 
 namespace App\Notifications;
 
+use App\Enums\NotificationType;
 use App\Models\Declaration;
 use App\Models\User;
 use Illuminate\Bus\Queueable;
@@ -33,6 +34,8 @@ class DeclarationMentionNotification extends Notification implements ShouldQueue
     public function toDatabase(object $notifiable): array
     {
         return [
+            'workspace_id' => $this->declaration->workspace_id,
+            'notification_type' => NotificationType::Mention,
             'declaration_id' => $this->declaration->id,
             'declaration_title' => $this->declaration->title,
             'mentioned_by_id' => $this->mentionedBy->id,