fix(libp2p): plumb advertise address to swarm.add_external_address

[sveitser]

• The CLI flag --libp2p-advertise-address (env ESPRESSO_NODE_LIBP2P_ADVERTISE_ADDRESS)
  was only used in the orchestrator-bootstrap branch (lib.rs:446) and never reached
  the libp2p Swarm in the persistence-loaded or peer-fetch branches. The flag's
  docstring promised that it "advertises to other nodes" but in production paths
  it was a silent no-op.

• Effect: validators behind NAT, K8s NodePort, or Docker bridge networking can only
  be reached by peers they have already established outbound connections to. Identify
  announces their bind-derived addresses (loopback / VPC-internal IPs), so peers that
  learn about them via DHT lookup, or that lose and try to re-establish a connection,
  cannot dial them. Coverage of the validator set is incomplete and degrades over
  time as connections drop. Observed-address from existing connections is not
  propagated by identify to third parties, and AutoNAT cannot self-confirm the
  public address because the bind-derived addresses it offers as probe candidates
  are not reachable.

• Fix: thread Vec through Libp2pNetwork::from_config (libp2p_network.rs)
  into NetworkNodeConfig.announce_addresses (config.rs), and call
  Swarm::add_external_address for each in NetworkNode::new (node.rs). The existing
  SwarmEvent::ExternalAddrConfirmed handler at node.rs already populates the DHT
  self-record once the address is confirmed.

• Also drop the default_value = "localhost:1769" on the CLI flag. Loopback was
  actively wrong as a default once the flag is wired through to identify; absent
  is now valid (no advertise) and bootstrapping the orchestrator without it
  errors explicitly with a clear message.

• Drive-by: fix a "fales" typo in a comment and whitelist the bimap crate name
  in .typos.toml so the pre-commit spell-check passes.

• References:

  rust-libp2p Swarm::add_external_address (libp2p-swarm 0.47):
  https://docs.rs/libp2p/0.56.0/libp2p/swarm/struct.Swarm.html#method.add_external_address
  "Add a confirmed external address for the local node. This function should
  only be called with addresses that are guaranteed to be reachable."

  libp2p Identify spec - the listenAddrs field that peers receive during
  identify exchange:
  https://github.com/libp2p/specs/blob/master/identify/README.md
  Without add_external_address, only listen addresses are populated, which for
  bind=0.0.0.0 means loopback and any local interface IPs.

[gemini-code-assist]

Code Review

This pull request updates the Libp2p networking configuration to support announcing external addresses, which is necessary for nodes operating behind NAT, K8s NodePort, or Docker bridges. The changes include updating the libp2p_advertise_address to be optional, introducing an announce_addresses field in the network configuration, and ensuring these addresses are added to the swarm as external addresses. Additionally, a minor typo in a comment was corrected. As there were no review comments provided, I have no feedback to offer.

[github-actions]

Nextest failures (1) in this run

Test	Attempts	Time (s)	Main history
espresso-node::api::test::test_tx_metadata	3	4.84	passing

See the step summary for flaky tests and slowest tests.