Add a stateful Proxmox API console and broad handler coverage beyond the

initial QEMU slice, backed by imported contracts for majors 6–9.
- Implement durable handlers for access/auth, cluster, LXC, storage, HA,
  firewall, Ceph, SDN, ACME, notifications, pools, mapping, and node ops
- Serve an interactive Web UI with catalog browsing, demo seed controls,
  and OpenAPI/help surfaces
- Bundle PVE 6.4-15, 7.4-16, and 8.4.5 contract revisions alongside 9.2.3
- Support in-memory runtime contract Apply (POST /ui/api/contract/apply)
  so /version and /api2 routes follow the selected major until restart
- Expand seed profiles (including demo-cluster), migrations 007–008, TLS
  gateway config, Compose/Makefile tooling, and compatibility evidence
- Tighten .gitignore for macOS, hidden directories (.*/), and local secrets

docs/domains/storage-backup.md

@@ -0,0 +1,16 @@
+# Storage & backup
+
+## Storage
+
+- Cluster and node storage inventories persist in normalized storage tables.
+- Content listings and mutations update `storage_contents` (and related rows).
+- `broken-storage` seed marks `local-lvm` unavailable for failure testing.
+
+## Backup
+
+- Backup jobs, metadata, and `vzdump`-style task paths create durable task rows
+  and backup records.
+- Workers execute leased backup tasks similarly to guest operations.
+
+No real remote backup targets are contacted; object state remains inside
+PostgreSQL.