Make ospf route more effiencient (#1512)

Avoid iterate all peer info and conn list when building sync request.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

easytier/src/tests/ipv6_test.rs

@@ -38,8 +38,7 @@ async fn test_route_peer_info_ipv6() {
     global_ctx.set_ipv6(Some(ipv6_cidr));
 
     // Create RoutePeerInfo with IPv6 support
-    let peer_info = RoutePeerInfo::new();
-    let updated_info = peer_info.update_self(123, 456, &global_ctx);
+    let updated_info = RoutePeerInfo::new_updated_self(123, 456, &global_ctx);
 
     // Verify IPv6 address is included
     assert!(updated_info.ipv6_addr.is_some());