Add Liberty Tire infrastructure doc

sites/liberty/network.md

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+# Liberty Tire and Brake — Network Infrastructure
+
+## Site
+- **Name:** Liberty Tire and Brake
+- **Site ID:** 66cfc43699ec0d7200188ed3
+- **Controller:** Standalone UDM Pro
+- **Gateway MAC:** d8:b3:70:28:67:a1
+- **WAN1:** 108.175.202.88 (Comcast)
+- **WAN2:** 69.245.114.73 (Hargray)
+- **Dual WAN:** Yes
+
+## Devices (7 total)
+- 1 Gateway (UDM Pro)
+- 5 WiFi APs
+- 1 Wired switch (USW-24-PoE, MAC E4:38:83:94:E6, IP 10.1.0.5)
+
+## Clients
+- ~26 active (11 wifi, 14 wired, 1 guest)
+
+## Known Issues
+- Yealink W70 cordless on switch port 1 — periodic static/packet-loss
+- 6 devices pending firmware updates
+
+## Credentials
+- **Network API Key:** Secured in Hermes vault
+
+## Backup Status
+- ❌ No automated backup — UDM Pro behind NAT
+
+## Last Verified
+- July 15, 2026 — Site Manager API confirmed online