Add unit and integration tests for collected invoice queue handling, route hardening, lifecycle validation, and manual batch processing logic.

services/nginx/app/traits/route_t.php

@@ -28,7 +28,8 @@ trait route_t
 
     public function __construct()
     {
-        $this->route = $_SERVER['REQUEST_URI'];
+        $requestUri = $_SERVER['REQUEST_URI'] ?? '/';
+        $this->route = is_string($requestUri) && $requestUri !== '' ? $requestUri : '/';
     }
 
     public function run(): void