Add remote-ops agent stub for the hub fleet control plane

One-line require of the platform-tools submodule agent. Needs HUB_OPS_SECRET
in .env and "Operações remotas" enabled on id.andmore.pt to respond.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

api/agent.php

@@ -0,0 +1,5 @@
+<?php
+// Remote-ops agent for the id.andmore.pt fleet control plane. Thin stub — the
+// logic ships in the platform-tools submodule so a single edit updates every app.
+// Requires HUB_OPS_SECRET in .env + "Operações remotas" enabled on the hub.
+require __DIR__ . '/../shared/platform-tools/api/agent.php';