docs: Add IP migration plan, fix gateways and static IPs

- Created IP-MIGRATION-PLAN.md with new allocation scheme
- Fixed all LXC gateways from 10.4.2.254 (Asus) to 10.4.2.1 (OPNsense)
- Set static IPs: UniFi (.16), Gitea (.17), Immich (.30)
- Migrated critical containers to local-lvm storage

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/IP-MIGRATION-PLAN.md

@@ -1,5 +1,19 @@
 # IP Address Migration Plan
 
+## Status: PAUSED
+
+**Completed 2025-12-22:**
+- [x] All LXC gateways fixed to 10.4.2.1 (OPNsense)
+- [x] UniFi set to static 10.4.2.16
+- [x] Gitea set to static 10.4.2.17
+- [x] Immich set to static 10.4.2.30
+
+**Pending:**
+- [ ] Media stack IP reorganization (10.4.2.20-29)
+- [ ] Pi-hole migration (10.4.2.129 → 10.4.2.11)
+- [ ] KavNas / Elantris IP updates
+- [ ] Traefik config updates for new IPs
+
 ## New IP Allocation Scheme
 
 | Range | Purpose |