fix: call connect_rdp_slot on session reuse

Previously connect_rdp_slot was only called when creating a new session.
If the API container restarted, existing sessions had should_be_connected=false
and xfreerdp never started. Now connect is triggered on every /go/<slug> visit
when an RDP session already exists.

app/main.py

@@ -505,6 +505,12 @@ def go_service(
             _mark("check_existing_ms", t_existing)
             if existing_user_session:
                 _emit("reuse_session", session_id=existing_user_session.id)
+                if existing_user_session.container_id and existing_user_session.container_id.startswith("RDPSLOT:"):
+                    try:
+                        _rdp_slot_id = int(existing_user_session.container_id.split(":", 1)[1])
+                        threading.Thread(target=connect_rdp_slot, args=(_rdp_slot_id,), daemon=True).start()
+                    except Exception:
+                        pass
                 return RedirectResponse(url=session_redirect_url(existing_user_session), status_code=303)
 
             t_limit = time.perf_counter()