Restore INFRASTRUCTURE.md from history and preserve current 9017 MGMT_LAN data

INFRASTRUCTURE.md

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-| 9017 | zlh-back | VM | 10.60.0.24 / 172.60.0.30 | — | Proxmox Backup Server |
+# ZeroLagHub Infrastructure
+
+## Dedicated Server — GTHost Detroit (Active)
+
+**Hardware:** Supermicro 2029TP-HTR  
+**CPU:** Intel Xeon Gold 6152 — 22 cores / 44 threads, 2.1–3.7GHz  
+**RAM:** 192GB DDR4  
+**Storage:** 2x 1.92TB SSD  
+**Network:** Unmetered bandwidth  
+**OS:** Proxmox VE 9.x  
+**Provider:** GTHost Detroit  
+**Cost:** $99/month  
+**Public IP:** 66.163.115.224 (Proxmox mgmt), additional IPs for OPNsense WAN  
+**IPMI:** Available via GTHost panel for out-of-band access
+
+---
+
+## Network Bridges (Proxmox)
+
+| Bridge | Purpose | Notes |
+|--------|---------|-------|
+| vmbr0 | WAN / Proxmox mgmt | ens6f0, 66.163.115.224/24 |
+| vmbr1 | CORE_LAN | 10.60.0.0/24 |
+| vmbr2 | DEV_LAN | |
+| vmbr3 | GAME_LAN | |
+| vmbr4 | VPN_LAN | |
+| vmbr5 | MGMT_LAN | 172.60.0.0/24 — Proxmox host at 172.60.0.6 |
+| vmbr6 | ZPACK_LAN | 10.70.0.0/24 |
+
+---
+
+## VM / LXC Inventory
+
+### Core Infrastructure (9000s)
+
+| ID | Name | Type | IP | WAN / MGMT | Role |
+|----|------|------|----|------------|------|
+| 9001 | zlh-router | VM | — | — | OPNsense 26.1 — core router, DHCP, firewall |
+| 9002 | zpack-router | VM | — | — | OPNsense 26.1 — game/dev router |
+| 9010 | zpack-dns | LXC | 10.60.0.14 | — | Technitium DNS |
+| 9011 | zlh-proxy | LXC | 10.60.0.16 | — | Caddy — core reverse proxy |
+| 9012 | zpack-proxy | LXC | 10.70.0.11 | — | Traefik v3 — game/dev edge, wildcard TLS |
+| 9013 | zlh-connect | LXC | — | — | Twingate connector — admin remote access |
+| 9014 | zlh-artifacts | LXC | 10.60.0.17 | — | Caddy file server — runtimes, jars, agent binaries |
+| 9015 | zpack-velocity | LXC | 10.70.0.10 | — | Velocity 3.5 — Minecraft proxy |
+| 9016 | zlh-monitor | LXC | 10.60.0.25 | — | Prometheus + Grafana |
+| 9017 | zlh-back | VM | 10.60.0.24 | 172.60.0.30 | Proxmox Backup Server |
+| 9020 | zpack-api | VM | 10.60.0.18 | — | Node.js API, MariaDB, Redis |
+| 9021 | zpack-portal | VM | 10.60.0.19 | — | Next.js portal |
+| 9030 | aimeesites | LXC | — | — | Static site hosting |
+
+### Templates
+
+| ID | Name | Notes |
+|----|------|-------|
+| 820 | zlh-base | Base LXC template for game/dev container provisioning |
+
+### ID Ranges
+
+| Range | Purpose |
+|-------|---------|
+| 9000s | Core infrastructure |
+| 5000+ | Game server containers (provisioned by platform) |
+| 6000+ | Dev containers (provisioned by platform) |
+
+---
+
+## DNS / Service Discovery Notes
+
+- `internal.zlh` is **not currently used** for active hot-path service discovery.
+- Prefer explicit env-configured IPs / addresses in runtime-critical paths.
+- DNS records may still exist historically or for reference, but should not be treated as the current source of truth for service routing.
+
+---
+
+## Backup Strategy
+
+- **PBS (zlh-back 9017)** — primary backup for all VMs/LXCs on new host
+- **Backblaze B2 (zpack-migration bucket)** — offsite copy of critical data and old host backups
+- Old Denver host decommissioned Apr 2, 2026 — OS wiped, disks striped
+
+---
+
+## Decommissioned
+
+| Server | Specs | Dates | Notes |
+|--------|-------|-------|-------|
+| GTHost Denver | Silver 4116 12c/24t, 192GB, 2x1.92TB SSD, $103/mo | Until Apr 2, 2026 | Migrated to Detroit. OS wiped Apr 2, 2026. |