Remove dead nip05::transfer client fn

Names are bound to the nostr key and are *released* on every key change,
never carried across to the new key — that's deliberate (security,
anti-squatting, anti-spam). Key rotation calls nip05::unregister (release);
nothing ever called nip05::transfer.

The name authority is dropping the /api/v1/transfer endpoint to enforce the
release-every-time policy structurally, so this client function would only
ever hit a 404. Remove it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/nostr/nip05.rs

@@ -305,48 +305,6 @@ pub async fn register(server: &str, name: &str, keys: &Keys) -> RegisterResult {
 	}
 }
 
-/// Atomically move an owned name to a new pubkey (key rotation).
-/// Signed by the OLD key; the server enforces ownership and the
-/// one-name-per-pubkey rule for the target key.
-pub async fn transfer(
-	server: &str,
-	name: &str,
-	old_keys: &Keys,
-	new_pubkey_hex: &str,
-) -> Result<(), String> {
-	let server = server.trim_end_matches('/');
-	let url = format!("{}/api/v1/transfer", server);
-	let body = serde_json::json!({
-		"name": name.to_lowercase(),
-		"new_pubkey": new_pubkey_hex,
-	})
-	.to_string();
-	let Some(auth) = nip98_auth(old_keys, &url, "POST", Some(body.as_bytes())) else {
-		return Err("auth event build failed".to_string());
-	};
-	let headers = vec![
-		("Authorization".to_string(), auth),
-		("Content-Type".to_string(), "application/json".to_string()),
-	];
-	let Some(resp) = nym::http_request("POST", url, Some(body), headers).await else {
-		return Err("network unavailable".to_string());
-	};
-	if resp.contains("\"transferred\":true") {
-		return Ok(());
-	}
-	let err = serde_json::from_str::<Value>(&resp)
-		.ok()
-		.and_then(|d| d.get("error").and_then(|e| e.as_str()).map(String::from))
-		.unwrap_or_else(|| {
-			if resp.trim().is_empty() {
-				"name server does not support transfer yet".to_string()
-			} else {
-				format!("unexpected response: {}", resp)
-			}
-		});
-	Err(err)
-}
-
 /// Release a registered name (NIP-98 authed by the owner).
 pub async fn unregister(server: &str, name: &str, keys: &Keys) -> Result<(), String> {
 	let server = server.trim_end_matches('/');