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/Http/Controllers/BulkNotificationController.php

@@ -3,7 +3,6 @@
 namespace App\Http\Controllers;
 
 use App\Concerns\HasWorkspaceScope;
-use App\Enums\DeclarationStatus;
 use App\Http\Requests\BulkNotifyRequest;
 use App\Mail\DeclarationFileRequestMail;
 use App\Models\Declaration;
@@ -24,7 +23,6 @@ class BulkNotificationController extends Controller
 
         $declarations = Declaration::where('workspace_id', $workspace->id)
             ->forUser($user, $workspaceUser)
-            ->where('status', DeclarationStatus::EnAttenteClient)
             ->whereIn('id', $request->validated('declaration_ids'))
             ->with('client')
             ->get()