feat: Slack alerts for chat widget escalations + support@ email polling

- notifications/slack.ts: added sendChatEscalationAlert (fires when visitor
  asks about pricing, demo, help, or a human) and sendSupportEmailAlert
- email-poller.ts: polls support@squaremcp.com every 5 min via IMAP,
  deduplicates with Redis (support📧alerted_uids), fires Slack alert
  for each new unseen message
- index.ts: detectEscalation() scans last user message for trigger phrases;
  chat endpoint fires alert fire-and-forget after responding; startEmailPoller()
  called on server boot

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

hermes-k8s.yaml

@@ -22,7 +22,7 @@ spec:
         fsGroup: 1000
       containers:
         - name: hermes-mcp
-          image: localhost:32000/hermes-mcp@sha256:54488f625b5a065f3cfb30d9d0afe269dac65aadd8206652d27da034daf1dee4
+          image: localhost:32000/hermes-mcp@sha256:0bd3355cc4b5a3727e56cd62364127deb8801d41f4e3b9dc48e9051e11f52b8f
           imagePullPolicy: Always
           securityContext:
             allowPrivilegeEscalation: false