docs: add full homelab documentation structure

docs/architecture/HARDWARE_INVENTORY.md

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+# Hardware Inventory
+
+## Serenity (NAS / Media Ingestion)
+- **OS:** Unraid 7.2.4
+- **IP:** 10.5.1.5 | Tailscale: 100.94.87.79
+- **CPU:** Xeon X5690
+- **RAM:** 102GB
+- **GPU:** None (Matrox IPMI only)
+- **UPS:** None
+
+### Storage
+| Pool | Type | Drives | Usable | Notes |
+|------|------|--------|--------|-------|
+| malcolm | RAIDZ1 | 6× 10TB HDD | ~40TB | Heavily utilized |
+| cache | ZFS single | 1× Kingston SNV2S 1TB NVMe | ~1TB | Appdata/Docker |
+
+### Key Shares
+| Share | Size | Purpose |
+|-------|------|---------|
+| data | 35TB | Media library |
+| immich | 62GB | Immich photo storage |
+| nextcloud | 7.4GB | Nextcloud data |
+| Tesla/dashcam | 1.6TB | Dashcam footage |
+| fizzlebang | 17GB | Personal files |
+| isos | 22GB | ISO images |
+| Syncthing | 4.6GB | Syncthing data |
+| manndra | — | Partner's storage |
+| Long and Low Crafts | — | Crafts business |
+| zfs_backups_array | — | ZFS backup target |
+
+---
+
+## PlausibleDeniability (Primary Docker Host)
+- **OS:** TrueNAS Scale 25.10.2.1
+- **CPU:** Ryzen 9 3950X
+- **RAM:** 32GB
+- **GPU:** Nvidia RTX 2080 Ti (11GB VRAM) — Plex, Immich ML, Ollama
+- **UPS:** None
+
+### Storage
+| Pool | Type | Mount | Notes |
+|------|------|-------|-------|
+| tank | ZFS mirror (2 drives) | `/mnt/tank` | ~3.5TB usable |
+| docker-ssd | Single Crucial MX500 500GB | `/mnt/docker-ssd` | No redundancy |
+| boot-pool | Single sdc3 | — | TrueNAS boot |
+
+### NFS Mounts
+- Serenity data array → `/mnt/unraid/data`
+
+---
+
+## N.O.M.A.D. (Offline Knowledge + Game Servers)
+- **OS:** Ubuntu 25.10 (bare metal)
+- **IP:** 10.5.1.16
+- **CPU:** Intel Core i7-4770K @ 3.50GHz (4c/8t, up to 3.9GHz)
+- **RAM:** 32GB DDR3 1600MHz (4×8GB)
+- **GPU:** NVIDIA GeForce GTX 1080 (8GB VRAM)
+- **NIC:** Intel I218-V (1GbE) + Aquantia AQC113 (10GbE)
+- **Motherboard:** ASRock H97M Pro4
+- **UPS:** None
+
+### Storage
+| Device | Size | Mount | Purpose |
+|--------|------|-------|---------|
+| Samsung SSD 840 (sdb) | 232.9GB | `/` (LVM 100GB) | OS boot |
+| WD Red HDD (sda) | 3.6TB | `/mnt/hdd-1` | Primary data, project-nomad symlink |
+| WD Red HDD (sdc) | 3.6TB | `/mnt/hdd-2` | Docker data-root |
+| Seagate SSD (sdd) | 223.6GB | `/mnt/ssd-1` | Fast scratch |
+
+---
+
+## Desktop: ROCINANTE
+- **OS:** Windows 11 Pro
+- **CPU:** Ryzen 7 9850X3D
+- **RAM:** 64GB
+- **GPU:** RTX 4090 (24GB VRAM)
+- **Role:** Heavy AI inference, local Ollama (expose via `OLLAMA_HOST=0.0.0.0`)