nixos/home: Separate router storage and uplinks

Give `river` a dedicated RDMA VF and two RSTP trunk attachments.
Keep client services on the router VIPs and carry Digiweb VLANs
over both switch paths.

Set VF trust, multicast reception, bridge MAC and ARP behavior for
local switching. Wait for Kea interface readiness and apply RSTP
costs through `mstpd` despite port-registration and rename races.

Load `palace`'s RAID module in the initrd. Record RouterOS and
RouterBOOT upgrades and validate port, carrier and switch outages.

Document the deployed architecture, interface handoffs and recovery
procedures. Add physical socket maps, NIC capacities and cable
connections alongside the logical topology and failover checks.

docs/README.md

@@ -65,10 +65,10 @@ portcullis (bare-metal edge box for Nikhef — staged, not yet in service)
 ## Site: home
 
 Redundant routers, VM host, storage, IoT containers and the workstation — see
-[`sites/home/README.md`](sites/home/README.md). The hand-configured switch fabric (jim/dave/brian)
-and the Digiweb WAN path are documented in [`sites/home/switches.md`](sites/home/switches.md); the
-5G modem being evaluated as a replacement for `stream`'s WAN is in
-[`sites/home/wwan.md`](sites/home/wwan.md).
+[`sites/home/README.md`](sites/home/README.md). The hand-configured switch fabric
+(`jim`/`dave`/`brian`/`shytzel`) and WAN paths are documented in
+[`sites/home/switches.md`](sites/home/switches.md); the 5G modem being evaluated as a replacement
+for `stream`'s WAN is in [`sites/home/wwan.md`](sites/home/wwan.md).
 
 ```
 h.nul.ie