Add webhook outbound, Contact→Calendar, checklist automation; v1.1.26

- Webhook CRUD (GET/POST/DELETE /api/admin-webhooks, POST .../test) with
  ⚡ Webhooks drawer in EmailPage; fires contact.new and reply.sent events
- Contact→Calendar: history panel shows checklist episodes within ±30 days
- Checklist automation: saveEdit auto-sets productionStatus (idea→scheduled
  for future dates, idea→published for past); ⚙ Tasks button generates
  Record (−14d) and Edit (−7d) calendar task events for scheduled episodes
- Audit log captures webhook-added, webhook-removed, webhook-test events
- Webhook infrastructure: state, disk persistence, fire-and-forget with
  AbortSignal.timeout(8000), loaded on startup

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

server.js

@@ -26,6 +26,7 @@ import {
   loadEmailSettingsFromDisk,
   loadCalendarEventsFromDisk,
   loadAuditLogFromDisk,
+  loadWebhooksFromDisk,
   createBackupSnapshot,
   refreshContentCaches,
   queueHitStatsWrite,
@@ -153,6 +154,7 @@ Promise.all([
   loadEmailSettingsFromDisk(),
   loadCalendarEventsFromDisk(),
   loadAuditLogFromDisk(),
+  loadWebhooksFromDisk(),
   refreshContentCaches(),
 ])
   .catch(err => {