fix(envlite): serve directory indexes so /wp-admin/ reaches wp-admin/index.php

Existing directories such as /wp-admin/ previously fell through to the
front controller, returning the front-end response instead of executing
src/wp-admin/index.php. Return false for directories with an index.php
so php -S serves the directory index. Directories without an index
still fall through to the front controller to avoid php -S's default
directory listings.

Author: sirreal

tools/local-env/router.php

@@ -9,7 +9,17 @@
 }
 
 $file = dirname(__DIR__, 2) . '/src' . $path;
-if ($path !== '/' && file_exists($file) && !is_dir($file)) {
-    return false;
+
+if ($path !== '/' && file_exists($file)) {
+    if (!is_dir($file)) {
+        return false;
+    }
+    // Existing directory: let the built-in server serve its index.php
+    // (e.g. /wp-admin/ -> wp-admin/index.php). Without an index, fall
+    // through to the front controller to avoid directory listings.
+    if (file_exists(rtrim($file, '/') . '/index.php')) {
+        return false;
+    }
 }
+
 require dirname(__DIR__, 2) . '/src/index.php';