refactor: better php8 usage

- Change simple property init and assign to constructor promotion
- Remove unused variable in catch()
- Change docs types to union types, where possible

app/Http/Controllers/Staff/BackupController.php

@@ -31,11 +31,9 @@ class BackupController extends Controller
     /**
      * Display All Backups.
      *
-     * @param \Illuminate\Http\Request $request
      *
-     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
      */
-    public function index(Request $request)
+    public function index(Request $request): \Illuminate\Contracts\View\Factory|\Illuminate\View\View
     {
         $user = $request->user();
         \abort_unless($user->group->is_owner, 403);
@@ -75,7 +73,6 @@ class BackupController extends Controller
     /**
      * Create A Backup.
      *
-     * @param \Illuminate\Http\Request $request
      *
      * @return string
      */
@@ -110,7 +107,6 @@ class BackupController extends Controller
     /**
      * Create A Backup.
      *
-     * @param \Illuminate\Http\Request $request
      *
      * @return string
      */
@@ -146,7 +142,6 @@ class BackupController extends Controller
     /**
      * Create A Backup.
      *
-     * @param \Illuminate\Http\Request $request
      *
      * @return string
      */
@@ -182,7 +177,6 @@ class BackupController extends Controller
     /**
      * Download A Backup.
      *
-     * @param \Illuminate\Http\Request $request
      *
      * @return \Symfony\Component\HttpFoundation\BinaryFileResponse|void
      */
@@ -211,7 +205,6 @@ class BackupController extends Controller
     /**
      * Deletes A Backup.
      *
-     * @param \Illuminate\Http\Request $request
      *
      * @return string
      */