refactor: Refactor file headers and add Psalm suppressions

- Added Psalm suppression annotations to multiple controller classes
- Added PHPDoc comment blocks to seeders and factories
- Added comments to indicate unused classes and methods
- Removed unused annotations and imports

app/Http/Middleware/LocalhostSessionMiddleware.php

@@ -14,6 +14,8 @@ class LocalhostSessionMiddleware
      * Whilst we are developing locally, automatically log in as
      * `['me' => config('app.url')]` as I can’t manually log in as
      * a .localhost domain.
+     *
+     * @psalm-suppress PossiblyUnusedMethod
      */
     public function handle(Request $request, Closure $next): Response
     {