NM reports a gsm connection's device as the control port (cdc-wdm0), but
IP + routes live on the wwan netdev (wwu1u2i4 on the Quectel EC25-AF), so
probes and route enforcement silently saw nothing (cellular stuck "down",
no metric). Map connection-keyed WANs through GENERAL.IP-IFACE, and let
the gateway fallback query the connection since the netdev isn't an NM
device.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>