logs.html/logs.js previously showed infra containers (hive-ci, hive-forge,
hive-gateway, hive-matrix) in an optgroup within the AGENT tab selector.
This was confusing because infra containers don't run the per-agent hive
daemons, making the unit filter meaningless for them.
Changes:
- Add INFRA tab (between AGENT and SYSTEM) with its own container selector
and full-machine-journal fetch (no unit filter).
- Remove the infra optgroup from the AGENT tab — it now shows agents only.
- loadContainerLists() replaces loadAgentList(): fetches /api/state once and
populates both selectors, avoiding a duplicate network request.
- Deep-link (?agent=hive-ci) now routes to the INFRA tab when the named
container is an infra container, falling back to AGENT otherwise.
- Remove syncUnitSelectForSelection() — no longer needed since the AGENT
tab no longer contains infra containers.
- Extend the 30s timestamp ticker to cover the INFRA tab fetch time.
No backend changes: /api/journal/{name} already supports infra container names.
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