🆙 Added fixed cms

Updated_Cms/app/Rules/ValidateInstallationKeyRule.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Rules;
+
+use App\Models\Miscellaneous\WebsiteInstallation;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class ValidateInstallationKeyRule implements ValidationRule
+{
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if ($value !== WebsiteInstallation::first()->installation_key) {
+            $fail('The :attribute does not match');
+        }
+    }
+}