Roles via Nextcloud groups: sms-admin/manager/viewer + fix OAuth instance_uri

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

composer.json

@@ -15,6 +15,7 @@
         "picqer/php-barcode-generator": "^3.3",
         "socialiteproviders/nextcloud": "^4.0",
         "spatie/laravel-activitylog": "^4.9",
+        "spatie/laravel-permission": "^6.25",
         "z3d0x/filament-logger": "^0.7.2"
     },
     "require-dev": {