fix: dashboard prefix detection with Go runtime metrics

Bug: Dashboard showed zeros because it detected "go" as the prefix instead
of "muxstr" when Go runtime metrics appeared first in the metrics list.

Fix: Search for the first metric containing "_relay_" to properly detect
the namespace (muxstr, nostr-grpc, etc.) instead of using the first metric
in the alphabetical list.

Before: Object.keys(metrics)[0] → "go_gc_..." → prefix = "go"
After: Find metric with "_relay_" → "muxstr_relay_..." → prefix = "muxstr"

This fixes the dashboard displaying zeros when metrics data is present.

0 files changed, 0 insertions, 0 deletions