docs: add disaster recovery runbook

docs/disaster-recovery/RUNBOOK.md

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+# KiteStacks Disaster Recovery Runbook
+
+## Purpose
+
+This document describes how to restore the entire KiteStacks platform if the primary server (Assassin) fails.
+
+## Current Infrastructure
+
+Primary Production:
+- Host: Assassin
+- IP: 192.168.1.205
+
+Cloud Backup:
+- Host: kscloud1
+- Public IP: 5.78.233.28
+
+Domains:
+- www.kitestacks.com
+- gitforge.kitestacks.com
+- www-backup.kitestacks.com
+- git-backup.kitestacks.com
+
+## Recovery Priority
+
+1. Forgejo
+2. Website
+3. Authentik
+4. Monitoring
+5. AI Services
+6. Knowledge Services
+
+## Current Backup Status
+
+Website Backup:
+- Operational on kscloud1
+
+Forgejo Backup:
+- Operational on kscloud1
+
+Git Repository:
+- Synced to both Forgejo instances
+
+## Validation Checklist
+
+- [ ] Website accessible
+- [ ] Backup website accessible
+- [ ] Forgejo operational
+- [ ] Backup Forgejo operational
+- [ ] Cloudflare DNS verified
+- [ ] Cloudflare Tunnel verified