update login scurity

app/Helpers/security_helper.php

@@ -0,0 +1,41 @@
+<?php
+
+if (! function_exists('sanitize_request_value')) {
+    /**
+     * Recursively normalize request values without applying output encoding.
+     */
+    function sanitize_request_value($value)
+    {
+        if (is_array($value)) {
+            foreach ($value as $key => $item) {
+                $value[$key] = sanitize_request_value($item);
+            }
+
+            return $value;
+        }
+
+        if (! is_string($value)) {
+            return $value;
+        }
+
+        $value = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/u', '', $value) ?? $value;
+
+        return trim($value);
+    }
+}
+
+if (! function_exists('require_env')) {
+    /**
+     * Fetch an environment variable and fail closed when it is missing.
+     */
+    function require_env(string $key): string
+    {
+        $value = env($key);
+
+        if ($value === null || $value === '') {
+            throw new RuntimeException(sprintf('Missing required environment variable: %s', $key));
+        }
+
+        return (string) $value;
+    }
+}