Add WebDAV support with user folderOnly restrictions

src/webdav/CurrentUser.php

@@ -0,0 +1,16 @@
+<?php
+// src/webdav/CurrentUser.php
+namespace FileRise\WebDAV;
+
+/**
+ * Singleton holder for the current WebDAV username.
+ */
+class CurrentUser {
+    private static string $user = 'Unknown';
+    public static function set(string $u): void {
+        self::$user = $u;
+    }
+    public static function get(): string {
+        return self::$user;
+    }
+}