Geographic Location for Media over QUIC Relays

This document defines a mechanism for Media over QUIC (MoQ) relays to advertise their geographic location (geocode) and related path metrics. Some clients require their media data to remain locally or geo-fenced within specific jurisdictions for privacy and security compliance (e.g., GDPR, HIPAA, or sector-specific regulations). This mechanism enables service providers to track the geographic path of media packets through the relay mesh and to enforce geo-fencing policies. It supports Geo-Distributed Orchestration and Routing (GDOR), data residency compliance, latency optimization, and relay selection. The specification includes optional IATA airport codes as human-readable geographic identifiers for major relay locations.