Initial Ladill Queue release — enterprise QMS standalone app.

Phases 1–6: tickets, counters, displays, appointments, workflows, rules, analytics, reports, feedback, admin, device API, and Gitea deploy workflow for queue.ladill.com.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Events/ServiceEventSignature.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Services\Events;
+
+class ServiceEventSignature
+{
+    public static function sign(string $body, string $secret): string
+    {
+        return 'sha256='.hash_hmac('sha256', $body, $secret);
+    }
+
+    public static function verify(string $body, string $signature, string $secret): bool
+    {
+        if ($secret === '' || $signature === '') {
+            return false;
+        }
+
+        return hash_equals(self::sign($body, $secret), $signature);
+    }
+}