fix(layout): prevent double footer rendering breaking Bootstrap dropdowns

renderUnifiedLayoutFooter() was called twice - once from view files and
once from BaseAdminController::render(). Since admin/footer.php uses
require (not require_once), this loaded vendor.min.js twice, recreating
jQuery and destroying Bootstrap's document-level dropdown handlers.

- Add static $rendered guard to renderUnifiedLayoutFooter() for idempotency
- Remove redundant footer call from BaseAdminController::render()
- Remove split-mode (.scripts.php) mechanism from BaseAdminController
- Add rRegisteredUsers, rLine to footer globals passthrough

src/public/Controllers/Admin/BaseAdminController.php

@@ -7,7 +7,6 @@
  *   1. renderUnifiedLayoutHeader('admin')
  *   2. require Views/admin/{view}.php — HTML-контент
  *   3. renderUnifiedLayoutFooter('admin')
- *   4. require Views/admin/{view}.scripts.php — page-specific JS
  *
  * Контроллер-наследник:
  *   - Вызывает requirePermission() для проверки доступа
@@ -153,19 +152,10 @@ class BaseAdminController {
 
         // 2. View content
         $__viewFile = $__viewsDir . $view . '.php';
-        $__scriptsFile = $__viewsDir . $view . '.scripts.php';
-        $__hasScriptsFile = file_exists($__scriptsFile);
 
         if (file_exists($__viewFile)) {
             require $__viewFile;
         }
-
-        // Split mode: separate .scripts.php exists → footer + scripts handled here.
-        // Otherwise: view handles its own footer/closing HTML.
-        if ($__hasScriptsFile) {
-            renderUnifiedLayoutFooter($this->scope);
-            require $__scriptsFile;
-        }
     }
 
     /**