Add pre-migration config capture checklist

SCRATCH/pre-migration-capture.md

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+# Pre-Migration Config Capture
+
+Run this on the old server before wiping PBS. Tick each off once saved.
+
+---
+
+## OPNsense — both routers (105, 1006)
+- [ ] System → Configuration → Backups → Download (saves full XML)
+- [ ] Note any manually installed plugins not in the XML (check Firmware → Plugins)
+
+## zlh-dns (1001)
+- [ ] Technitium: Settings → Backup → Download backup file
+- [ ] Note the listening IP/port if non-default
+
+## zlh-proxy / zlh-zpack-proxy (1002, 1004)
+- [ ] Copy `/etc/traefik/` or wherever config lives
+- [ ] Note any env vars set in the systemd unit (`systemctl cat traefik`)
+
+## zlh-artifacts (1003)
+- [ ] `du -sh` the content tree — confirms rsync scope
+- [ ] Note the Caddy config (file server root path, any auth middleware)
+
+## zlh-velocity (300)
+- [ ] Note exact Velocity version (`java -jar velocity.jar --version` or check jar filename)
+- [ ] Copy velocity.toml
+- [ ] Copy plugins/ dir (custom routing plugin + any others)
+
+## zpac-api (1005)
+- [ ] Copy .env file — this is the main thing not in git
+- [ ] Confirm Node version (`node --version`)
+
+## zpac-portal (1100)
+- [ ] Copy .env / .env.local — not in git
+- [ ] Confirm Node version
+
+## zlh-monitor (104)
+- [ ] Copy Prometheus config + any custom dashboards from Grafana (export JSON)
+- [ ] Note any scrape targets that point to internal IPs — will need updating after migration
+
+## zlh-connect (9000 / Twingate)
+- [ ] Note the connector name in the Twingate dashboard — you'll re-register a new connector, old one gets removed
+
+## aimeesites (4000)
+- [ ] Whatever's running in here — note the webroot and any custom config
+
+---
+
+## Quick sweeps (run on each container before rebuild)
+```bash
+# Any cron jobs?
+crontab -l
+
+# Any custom systemd units?
+systemctl list-units --type=service --state=running | grep -v systemd
+
+# Env file locations
+find /etc /opt /root /home -name ".env" -o -name "*.env" 2>/dev/null
+```