Thread RuntimeServices into downstream handlers

[prk-Jr]

Summary

RuntimeServices is constructed at the Fastly adapter entry point but not yet threaded into the downstream handlers (handle_auction, handle_publisher_request, and the synthetic ID handler). Those handlers still call GeoInfo::from_request and other deprecated Fastly-specific APIs directly.

Work

• Pass &RuntimeServices through route_request into each handler
• Replace GeoInfo::from_request call sites with runtime_services.geo().lookup(runtime_services.client_info.client_ip)
• Remove the #[allow(deprecated)] annotations added as a temporary shim

Context

Flagged in #545 by @ChristianPavilonis. Part of the EdgeZero platform portability migration.