fix: keep background jobs alive

Add a background job orchestrator that restores profile jobs from saved credentials,
keeps pickup and store-watch schedules alive without UI logins, and exposes job
status via health/admin endpoints.

services/pickupScheduler.js

@@ -1122,7 +1122,7 @@ function scheduleStoreWatchers(sessionId, settings) {
     return false;
   }
   const cronExpression = effectiveSettings.storeWatchCron || DEFAULT_SETTINGS.storeWatchCron;
-  const job = cron.schedule(
+  const cronJob = cron.schedule(
     cronExpression,
     () => {
       checkWatchedStores(sessionId, effectiveSettings).catch((error) => {
@@ -1131,14 +1131,22 @@ function scheduleStoreWatchers(sessionId, settings) {
     },
     { timezone: 'Europe/Berlin' }
   );
-  sessionStore.attachJob(sessionId, job);
-  setTimeout(
+  let initialTimeout = setTimeout(
     () => checkWatchedStores(sessionId, effectiveSettings),
     randomDelayMs(
       effectiveSettings.storeWatchInitialDelayMinSeconds,
       effectiveSettings.storeWatchInitialDelayMaxSeconds
     )
   );
+  sessionStore.attachJob(sessionId, {
+    stop: () => {
+      cronJob.stop();
+      if (initialTimeout) {
+        clearTimeout(initialTimeout);
+        initialTimeout = null;
+      }
+    }
+  });
   console.log(
     `[WATCH] Überwache ${watchers.length} Betriebe für Session ${sessionId} (Cron: ${cronExpression}).`
   );