Remote reverse-proxy instances (proxy-1) connect to the management server
over Traefik via the ProxyService gRPC path. Traefik only routed
ManagementService, so the remote proxy's mapping stream got Traefik's 404
HTML. Add a router for /management.ProxyService/ to the same management
backend (h2c:33073). The local VPS-1 proxy is unaffected (it uses
management:33073 directly).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>