docs: add homelab-inventory — the machine-derived fleet inventory layer

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New doc for the weekly self-deriving inventory pipeline: a three-tier
Ansible collection (hardware off the hypervisors/firewall, VMs/LXCs from
the Proxmox APIs, listening sockets off every guest) writing three linked
NocoDB tables, read live behind a Dashy page.

Covers the design decisions worth defending: ss -tlnp over systemctl for
"what does this host serve", merge-only-by-omission on Tier 1 to protect
the one hand-entered field a lying SMBIOS can't provide, API-only Tier 2
because the two Proxmox nodes aren't clustered, stdlib-only push scripts,
and the deliberate KB-vs-machine-layer separation.

Pipeline diagram + four screenshots (Dashy page, all three NocoDB tables).
Provenance comment wired to the ansible roles/playbooks, the rocky Caddy/
dashy config, and KB note O0d4fqw0mr05. Indexed in README under Systems.

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