feat: include job config and run history in export/import backup

Export bumped to version 3, now includes jobs (with raw unmasked
config) and job_runs arrays. Import restores them when present and
restarts the scheduler. Payloads without a jobs key leave jobs
untouched, keeping v1/v2 backups fully compatible.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

js/ui.js

@@ -382,15 +382,17 @@ async function importDB() {
   document.getElementById('confirm-ok').onclick = async () => {
     closeConfirm();
     try {
-      const { instances, history = [] } = JSON.parse(await file.text());
+      const { instances, history = [], jobs, job_runs } = JSON.parse(await file.text());
       const res = await fetch('/api/import', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ instances, history }),
+        body: JSON.stringify({ instances, history, jobs, job_runs }),
       });
       const data = await res.json();
       if (!res.ok) { showToast(data.error ?? 'Import failed', 'error'); return; }
-      showToast(`Imported ${data.imported} instance${data.imported !== 1 ? 's' : ''}`, 'success');
+      const parts = [`${data.imported} instance${data.imported !== 1 ? 's' : ''}`];
+      if (data.imported_jobs != null) parts.push(`${data.imported_jobs} job${data.imported_jobs !== 1 ? 's' : ''}`);
+      showToast(`Imported ${parts.join(', ')}`, 'success');
       closeSettingsModal();
       renderDashboard();
     } catch {