feat(cli): add multicast groups to status (#3447)

[bgm-malbeclabs]

Summary of Changes

This PR adds multicast groups to the dz status command. Sample output is below:

Table mode:

| Session Status | ... | Multicast Groups         |
|----------------|-----|--------------------------|
| BGP Session Up | ... | P:solana-lv,S:solana-ams |

JSON mode:

{
  "multicast_groups": {
    "publisher": ["solana-lv"],
    "subscriber": ["solana-ams"]
  }
}

Testing Verification

• e2e updated with new fixtures
• tests added to validate new output

Closes #3447

[Copilot]

Pull request overview

Adds multicast publisher/subscriber group visibility to the doublezero status CLI by enriching daemon /v2/status responses with multicast group codes and rendering them as a new “Multicast Groups” column (with corresponding e2e + unit test updates).

Changes:

• Extend daemon /v2/status enriched service status with multicast_groups.publisher / multicast_groups.subscriber.
• Update CLI status output (table + JSON) to include a “Multicast Groups” column formatted as P:<code>,S:<code>.
• Update unit tests and e2e golden fixtures to validate the new field/column.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
e2e/multicast_test.go	Passes expected multicast group string into status fixture rendering for multicast scenarios.
e2e/fixtures/multicast/doublezero_status_disconnected.tmpl	Updates expected status table to include the new “Multicast Groups” column.
e2e/fixtures/multicast/doublezero_status_connected_subscriber.tmpl	Adds “Multicast Groups” column and renders expected subscriber groups.
e2e/fixtures/multicast/doublezero_status_connected_publisher.tmpl	Adds “Multicast Groups” column and renders expected publisher groups.
e2e/fixtures/ibrl/doublezero_status_disconnected.tmpl	Updates expected status output to include the new column (empty for IBRL).
e2e/fixtures/ibrl/doublezero_status_connected.tmpl	Updates expected connected IBRL status output to include the new column (empty).
e2e/fixtures/ibrl_with_allocated_addr/doublezero_status_disconnected.tmpl	Updates expected disconnected output to include the new column (empty).
e2e/fixtures/ibrl_with_allocated_addr/doublezero_status_connected.tmpl	Updates expected connected output to include the new column (empty).
client/doublezerod/internal/manager/reconciler_test.go	Extends enrichment tests to assert publisher/subscriber multicast group codes.
client/doublezerod/internal/manager/http.go	Adds multicast_groups to enriched /v2/status output and populates it from on-chain program data.
client/doublezero/src/servicecontroller.rs	Adds MulticastGroups + deserialization defaults to client-side /v2/status types.
client/doublezero/src/command/status.rs	Adds display formatting + column plumbing + tests for multicast groups in status.
CHANGELOG.md	Notes the new status multicast group reporting behavior.

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