fix: use hex format for pubkey in NIP-11 document

The NIP-11 specification requires the pubkey field to be a 64-character
hex string, but we were incorrectly using npub (bech32) format.

Changes:
- Add Config::relay_owner_pubkey_hex() method to get hex format
- Update NIP-11 document to use hex format instead of npub
- Update test to verify 64-char hex string instead of npub format

Fixes nak relay command error:
'must be a hex string of 64 characters'

1 files changed, 7 insertions, 1 deletions

diff --git a/src/config.rs b/src/config.rs
index 4b1e8d9..271a340 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -574,7 +574,13 @@ impl Config {
         Keys::parse(nsec).context("Invalid relay_owner_nsec")
     }
 
-    /// Get the relay owner's public key (npub format) for NIP-11
+    /// Get the relay owner's public key (hex format) for NIP-11
+    pub fn relay_owner_pubkey_hex(&self) -> Result<String> {
+        let keys = self.relay_owner_keys()?;
+        Ok(keys.public_key().to_hex())
+    }
+
+    /// Get the relay owner's public key (npub format)
     pub fn relay_owner_npub(&self) -> Result<String> {
         let keys = self.relay_owner_keys()?;
         Ok(keys.public_key().to_bech32()?)