feat: server identity parsing, relay list fetching, and fetch_events (CEP-17)#82
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Part of CEP-17 implementation #80.
Adds all the standalone building blocks for client-side relay discovery - no transport wiring yet, that's PR 2.
What's new:
parse_server_identity() - accepts hex pubkey, npub, or nprofile. Extracts relay hints from nprofile for use in relay resolution later. NostrClientTransport now uses this instead of PublicKey::from_hex(), so nprofile identifiers work as serverPubkey today.
fetch_server_relay_list() - creates a temporary relay pool, connects to discovery relays, fetches kind 10002, returns parsed RelayListEntry vec with url + optional marker. Disconnects in all code paths.
select_operational_relay_urls() - picks operational relays from a relay list. Prefers unmarked entries, falls back to read+write union, deduplicates.
RelayPoolTrait::fetch_events() - added Vec variant to the trait and all impls (RelayPool, MockRelayPool, TestRelayPool). MockRelayPool also gets inject_event() for test setup.