Add VRRP failover infrastructure documentation (Nobara)

Deployed automatic failover for critical services (Traefik, Vaultwarden,
Authentik, AdGuard) from Unraid to Nobara workstation via Keepalived VRRP
with VIP 192.168.10.250. ~4 second failover time.

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

CLAUDE.md

@@ -7,6 +7,17 @@ When user says "connect unraid", use this command:
 ssh -i ~/.ssh/id_ed25519_unraid root@192.168.10.20 -p 422
 ```
 
+## Connect to Nobara (Failover Node)
+
+```bash
+ssh nobara
+# or: ssh -i ~/.ssh/id_ed25519_nobara jazzymc@192.168.10.103
+# sudo password: (same as SSH login)
+```
+
+Failover stack: `/home/failover/docker-compose.yml`
+Keepalived: `systemctl status keepalived`
+
 ## Connect to MikroTik HAP ax³
 
 SSH port is **2222** (not 22):
@@ -56,6 +67,7 @@ infrastructure/
     ├── 07-WIFI-CAPSMAN-CONFIG.md     # WiFi and CAPsMAN settings
     ├── 08-DNS-ARCHITECTURE.md        # DNS failover architecture
     ├── 09-TAILSCALE-VPN.md           # Tailscale VPN setup
+    ├── 10-FAILOVER-NOBARA.md        # VRRP failover to Nobara
     ├── CHANGELOG.md                  # Change history
     ├── archive/                      # Completed/legacy docs
     │   └── vlan-migration/           # VLAN migration project artifacts