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a52a004737
Adds Relay.HasURLs/AllURLs helpers so all relay-enabled checks use the
same definition ("any URL is configured, regardless of whether it came
from Addresses or Endpoints"), and a Normalize step run at startup that:
- Drops unknown transport identifiers (anything outside ws/quic/wt),
reporting them via a warning log so misconfigurations surface loudly
instead of being silently advertised to clients.
- De-duplicates endpoint URLs and per-endpoint transports.
- Preserves empty Transports lists — that's the valid "unknown, let the
client try whatever it supports" signal, distinct from a typo'd list.
The two relay-token guard sites in server.go switch to HasURLs so a
deployment with only Endpoints (no Addresses) actually issues tokens;
before this change those branches would skip token generation. The
startup log now prints the merged URL list plus per-endpoint transport
hints, matching what clients will receive.