Miner dashboard chat: governor action-dispatch

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Context

Part of epic #6504's chat track, blocked on the action-dispatch scaffolding child issue of this same epic. Governor pause/resume already has a real API route (/api/governor/{pause,resume}, wired from ledgers.tsx's existing governor-control section) — this issue wires chat to call that same, already-existing route.

Requirements

• Wire chat's action-dispatch layer (from the scaffolding child issue) to call the existing /api/governor/{pause,resume} routes — never a new or parallel route.
• No changes to the existing route or button-triggered flow.

Deliverables

• Chat wiring to the existing governor pause/resume routes
• Test coverage

Test Coverage Requirements

99%+ Codecov patch coverage on every changed line and branch, plus a regression test for the new/changed behavior (note: apps/** UI code may fall outside the strict Codecov patch gate — check coverage.include — but a before/after screenshot table per this repo's UI-PR convention is still required for any visual change).

Expected Outcome

Chat can trigger governor pause/resume through the exact same governed endpoint the dashboard buttons already use.

Links & Resources

Epic: #6504. Blocked by the "action-dispatch scaffolding" issue in this same epic. apps/loopover-miner-ui/src/routes/ledgers.tsx.

[linear-code]

JSO-4722