Executes a maintenance action using a previously generated token. Two action types are supported:

• UNLOCK_STUCK: Unlocks all stuck distributions, allowing them to be retried or cleaned up. Returns a report listing the stuck distributions and whether they were unlocked.
• STOP_ALL: Force-stops all in-progress distributions across the cluster, aborts all non-final trackers in the database, and flushes the task queue. Returns a report with affected tracker counts and queue flush status.

The dryRun query parameter (defaults to true) allows previewing what would be affected without actually performing the action.

Requires admin permissions.