Added achievement data

app/Services/Achievements/Checkers/AchievementCheckerInterface.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Services\Achievements\Checkers;
+
+use App\Models\User;
+
+interface AchievementCheckerInterface
+{
+    /**
+     * Check all achievements in this category for the given user.
+     * Implementations should call $this->service->award() or $this->service->revoke()
+     * — never touch user_achievements directly.
+     */
+    public function check(): void;
+}