fix(alliance): fall back Digevo prod endpoint to LATAM West

[zortos293]

Summary

Digevo accounts could not get past provider routing: NVIDIA discovery (\pcs.geforcenow.com/v1/serviceUrls) still advertises \https://prod.DIG.geforcenow.nvidiagrid.net/\, but that hostname has no DNS records globally (NODATA/NXDOMAIN on every resolver tested, including with LATAM EDNS client subnets). Region discovery, VPC lookup, and all CloudMatch session routing for Digevo therefore failed.

This routes Digevo to the working regional endpoint \https://latam-west.dig.geforcenow.nvidiagrid.net/\ (server \NPA-DIG-SCL-01, region LATAM West) whenever discovery returns the stale prod host. The fallback stays within the existing HTTPS
vidiagrid.net\ trust policy; no protocol or ABI change.

Changes

• 
  ative/opennow-core/src/gfn.rs: new \effective_provider_url()\ / \provider_streaming_base(); Digevo stale-host fallback applied in discovery normalization, \provider_regions, \�pc_id, and session validation.
• 
  ative/opennow-core/src/cloudmatch.rs:
  equested_streaming_base()\ uses the effective provider URL.
• 
  ative/opennow-core/src/gfn/routing_tests.rs: new test for the fallback mapping and passthrough.

Verification

• \cargo test -p opennow-core --bin opennow-core: 478 passed, 0 failed; \cargo fmt --check\ clean; no new clippy warnings.
• Live end-to-end with real Alliance accounts at 1080p60 H264 (device login through browser, regions, subscription, library, launch inspect, session create/poll, NVST transport, first video frame):
  • Digevo (ULTIMATE): full loop incl. first frame, via both headless core and the Qt GUI in-process streamer.
  • GFN Korea (FREE): full loop incl. first frame after FREE queue cleared.

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