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/state.js

@@ -99,6 +99,9 @@ export const state = {
   auditLog: [],
   auditLogWritePromise: Promise.resolve(),
 
+  webhooks: [],
+  webhooksWritePromise: Promise.resolve(),
+
   lastBackupStatus: { ok: true, at: null, error: null, file: null },
   lastCachePurgeStatus: { ok: true, at: null, error: null },
   lastDeployHookStatus: { ok: true, at: null, error: null },