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/ValidateSignature.php

@@ -10,6 +10,7 @@ class ValidateSignature extends Middleware
      * The names of the query string parameters that should be ignored.
      *
      * @var array<int, string>
+     * @psalm-suppress PossiblyUnusedProperty
      */
     protected $except = [
         // 'fbclid',