Adds no-op Transports and callbacks

client/internal/pqkem_adapter.go

@@ -0,0 +1,23 @@
+package internal
+
+import "github.com/netbirdio/netbird/client/internal/pqkem"
+
+// No-op adapters wiring the engine to the ML-KEM manager's two seams. They are
+// placeholders so the manager can be instantiated and its lifecycle managed while
+// the real integration is built.
+//
+// TODO(NET-1406):
+//   - noopPQTransport -> real tunnel-UDP transport (send over the WG data path,
+//     feed inbound to Manager.OnDataPathMessage), analogue of go-rosenpass's Conn.
+//   - noopPQCallbackHandler -> program the derived PSK via iface/wgctrl on
+//     OnNewPSKReady, and tear the peer down / trigger ICE reconnect on OnRekeyFailed.
+
+type noopPQTransport struct{}
+
+func (noopPQTransport) SendDataPath(remoteID string, msg []byte) error { return nil }
+
+type noopPQCallbackHandler struct{}
+
+func (noopPQCallbackHandler) OnNewPSKReady(remoteID string, psk pqkem.PSK) error { return nil }
+
+func (noopPQCallbackHandler) OnRekeyFailed(remoteID string) error { return nil }