servers: add new host dirs, refresh fleet snapshots, orientation doc

Bundles the inventory expansion since 2026-04-22:

- New host dirs (READMEs + ssh-target where dir name doesn't resolve):
    ana-nas, ana-wg, esh-vm-db, nh3-nas, pbs-ana, pbs-nh3.
- New PFI VM snapshots (registered + key-installed 2026-04-23):
    ana-filebot, pfi-ana-webhost, pfi-postgres, pfi-pteradactyl,
    pfi-tacticalrmm, sf-ana-container, sfsrv-ana (system + proxmox).
- servers/irv-ml1: ONBOARDING.md (the first-time setup notes from when
  the host was brought into the fleet) + ssh-target (10.100.79.3 over
  the WG tunnel — name doesn't DNS-resolve from this workstation).
- servers/{ana-ml2,pfi-pve,sf-r630}/README.md: updates to capture BMC
  IPs, the iDRAC vs OS hostname distinction (sf-r630 hardware =
  sfsrv-ana OS), and the ana-ml2 Supermicro BMC (10.250.250.50,
  distinct from the Dell R750xs iDRAC).
- configs/homepage/docker.yaml: irv-ml1-docker provider added so
  homepage auto-discovers irv-ml1's stacks over the WG tunnel.
- docs/orientation.md: narrative fleet overview written for fresh
  Claude sessions — sites, backup architecture, governing principles,
  gotchas, where-to-look guide. Pointed at from CLAUDE.md.

servers/ana-ml2/README.md

@@ -4,11 +4,15 @@ Primary AI inference host for PFI.
 
 ## Network
 
-- **LAN IP:** 10.250.50.54
-- **SSH:** standard port 22
+- **LAN IP:** 10.250.50.54 (in-band, OS-side)
+- **BMC (OOB):** 10.250.250.50 — Supermicro IPMI web UI
+  at <https://10.250.250.50> (homepage card: *PFI-ANA-ML2 BMC*)
+- **SSH:** standard port 22 on 10.250.50.54
 
 ## Hardware
 
+- **Chassis:** Supermicro mid-range inferencing server (bare metal,
+  NOT Dell / not the same box as sf-r630 / sfsrv-ana)
 - **CPU:** AMD EPYC 9254 24-core (96 threads)
 - **RAM:** 566 GB
 - **GPUs:** 2x NVIDIA RTX 6000 Ada Generation (46 GB VRAM each, GPU 0 and GPU 1)