Add new templates for user authentication and management

- Created `unlogged-layout.php` and `unlogged.php` for the login page layout.
- Implemented `main-view.php` for system update management with progress tracking.
- Added `user-2fa.php` for two-factor authentication verification.
- Developed `user-edit.php` for editing user details and privileges.
- Introduced `users-list.php` for displaying and managing user accounts.
- Added `.htaccess` configuration for URL rewriting and security settings.

admin/templates/filemanager/filemanager.php

@@ -0,0 +1,7 @@
+<?
+$_SESSION['rfm_akey'] = bin2hex(random_bytes(16));
+$_SESSION['rfm_akey_expires'] = time() + 20*60;
+$_SESSION['can_use_rfm'] = true;
+$rfmAkeyJS = $_SESSION['rfm_akey'];
+?>
+<iframe src="/libraries/filemanager-9.14.1/dialog.php?akey=<?= $rfmAkeyJS ?>" style="border: 0px; width: 100%; height: 800px; background: #FFF; padding: 5px;"></iframe>