feat(state): send TAK CoT to additional TAK servers

[c310j]

Stacked on #2258. This branch contains #2258's two KPI metrics commits plus one new commit (5722b63c8). Please review/merge #2258 first; the diff for this PR alone is that last commit.

Summary

Adds an optional tak.additionalServers list to the TwinManager config, so the CoT that the TAK output composes (including MTI status augmentation) can be delivered to more than one TAK server.

• Every CoT event, detection and removal is handed to each additional server as the identical XML sent to the primary server.
• Each additional server gets its own shared TakSocketConnection (connection, bounded queue, writer thread). An unreachable server only fills and drops its own queue; it never delays the primary or the other servers.
• Each server can have its own TLS settings, key store and trust store, so servers behind different certificate authorities are supported.
• Per-server health is exported as a new JMX bean type=Integration,name=TakServer,server=<host>_<port>,role=primary|additional (connected, connects, connect failures, disconnects, drops, writes, last write age, queue size). The existing TakOutput counters stay as process-wide totals.
• New TakServerDTO for the list entries, so TakProtocolDTO doesn't reference itself in the REST schema.

With the list empty (the default), behaviour is unchanged.

Example:

tak:
  hostname: tak.example.org
  port: 8089
  sharedConnection: true
  tlsEnabled: true
  # keyStore / trustStore as today
  additionalServers:
    - hostname: tak2.example.org
      port: 8089
      tlsEnabled: true
      keyStore:   { type: PKCS12, path: /opt/maps/conf/tak2-client.p12, alias: maps, passphrase: ... }
      trustStore: { type: PKCS12, path: /opt/maps/conf/tak2-trust.p12, passphrase: ... }

Test plan

• AdditionalTakServersTest (real loopback sockets): every server receives the identical CoT event; an unreachable server does not delay delivery to a live one; SSL factory resolved once per server; empty/null lists
• TakSocketConnectionTest: writes and connect failures are counted per server, and only for that server
• TwinManagerConfigTest: additionalServers parsed, invalid entries (no hostname) skipped, default empty, written back by toConfigurationProperties
• All io.mapsmessaging.state.** tests pass (868 run, 0 failures)
• Live: deployed to an exercise hub with an empty list; primary TAK connection unaffected, and the new per-server bean reports the primary connection (connected, 0 failures, 0 drops)

🤖 Generated with Claude Code

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