fix: normalize directory separators in route file paths for Windows

Fixes #7474

On Windows, realpath() returns paths with backslashes (e.g.,
D:\path\to\file.php) while routeFiles paths use forward slashes
(App/Config/Routes.php). This caused in_array() comparison to fail
in loadRoutes(), preventing route files from being recognized as
already loaded and causing 404 override tests to fail.

The fix normalizes all realpath() results to use forward slashes,
making path comparisons consistent across platforms.

Ref: #7474

Author: jalexiscv

system/Router/RouteCollection.php

@@ -297,7 +297,7 @@ public function __construct(FileLocatorInterface $locator, Modules $moduleConfig
         // Normalize the path string in routeFiles array.
         foreach ($this->routeFiles as $routeKey => $routesFile) {
             $realpath                    = realpath($routesFile);
-            $this->routeFiles[$routeKey] = ($realpath === false) ? $routesFile : $realpath;
+            $this->routeFiles[$routeKey] = ($realpath === false) ? $routesFile : str_replace('\\', '/', $realpath);
         }
     }
 
@@ -316,7 +316,7 @@ public function loadRoutes(string $routesFile = APPPATH . 'Config/Routes.php')
 
         // Normalize the path string in routesFile
         $realpath   = realpath($routesFile);
-        $routesFile = ($realpath === false) ? $routesFile : $realpath;
+        $routesFile = ($realpath === false) ? $routesFile : str_replace('\\', '/', $realpath);
 
         // Include the passed in routesFile if it doesn't exist.
         // Only keeping that around for BC purposes for now.