Clear finished jobs' steps a minute after they end

Job steps (bots_queue_updates) only feed the live working row, so the
new clear-job-steps cron deletes them shortly after a job ends, however
it ended, keeping their count on bots_queue.steps for the message
details. Not done the moment a job ends: the live relay would miss the
last ones.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/data/app-data.ts

@@ -414,6 +414,12 @@ export const AppData = {
      * working-on panel shows.
      */
     BotJobUpdatesShown: 12,
+    /**
+     * How long a finished job's steps stay before they're cleared
+     * (`clear-job-steps` cron). Long enough for every process's live relay
+     * to have pushed the last ones (`LiveRelayPollMs`).
+     */
+    BotJobStepsKeepMs: 60 * 1000,
     /**
      * How often each server process reads new bot messages, job steps and
      * bot changes from the database for its own sockets (`liveRelay`).