Description

Add traceroute functionality to discover the network path to remote nodes.

Requirements

• Create TracerouteResult model (hops with SNR, distance, MQTT flag)
• Add traceroute request in MeshtasticProtocolService (send RouteDiscovery on port 70)
• Enhance handleTraceroutePacket() to parse full hop data with SNR
• Create TracerouteSheet.swift — hop table with node names, SNR, RTT
• Add "Traceroute" button in NodeInfoSheet and node context menus
• Save/load traceroute results to JSON files via TracerouteStore