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.

nixos/boxes/home/palace/vms/default.nix

@@ -10,6 +10,7 @@
     inherit (lib) mkMerge;
     inherit (lib.my) vm;
     inherit (lib.my.c) networkd;
+    inherit (lib.my.c.home) hiMTU;
 
     installerDisk = {
       name = "installer";
@@ -28,10 +29,11 @@
   {
     systemd.network = {
       netdevs = {
-        "25-vm-et1g0" = {
+        "25-river-jim-tap" = {
            netdevConfig = {
-             Name = "vm-et1g0";
+             Name = "river-jim-tap";
              Kind = "macvtap";
+             MTUBytes = toString hiMTU;
            };
            # TODO: Upstream this missing section
            extraConfig = ''
@@ -41,16 +43,24 @@
         };
       };
       networks = {
-        "75-et1g0" = {
-          matchConfig.Name = "et1g0";
-          linkConfig.RequiredForOnline = "no";
+        "75-river-jim-phy" = {
+          matchConfig.Name = "river-jim-phy";
+          linkConfig = {
+            RequiredForOnline = "no";
+            MTUBytes = toString hiMTU;
+          };
           networkConfig = {
-            MACVTAP = "vm-et1g0";
+            MACVTAP = "river-jim-tap";
           } // networkd.noL3;
         };
-        "75-vm-et1g0" = {
-          matchConfig.Name = "vm-et1g0";
-          linkConfig.RequiredForOnline = "no";
+        "75-river-jim-tap" = {
+          matchConfig.Name = "river-jim-tap";
+          linkConfig = {
+            RequiredForOnline = "no";
+            MTUBytes = toString hiMTU;
+            # Guest receive-filter changes are not synchronized to the host macvtap.
+            AllMulticast = true;
+          };
           networkConfig = networkd.noL3;
         };
       };
@@ -79,7 +89,7 @@
 
       "vm@river" =
       let
-        vtapUnit = "sys-subsystem-net-devices-vm\\x2det1g0.device";
+        vtapUnit = "sys-subsystem-net-devices-river\\x2djim\\x2dtap.device";
       in
       mkMerge [
         (awaitVM "cellar")
@@ -109,7 +119,7 @@
               (vm.disk "cellar" "persist")
             ];
             hostDevices = {
-              et100g0vf0 = {
+              cellar-hi = {
                 index = 0;
                 hostBDF = "44:00.1";
               };
@@ -142,8 +152,8 @@
             memory = 4096;
             cleanShutdown.timeout = 60;
             networks = {
-              et1g0 = {
-                ifname = "vm-et1g0";
+              lan-jim = {
+                ifname = "river-jim-tap";
                 bridge = null;
                 tapFD = 100;
                 # Real hardware MAC
@@ -156,10 +166,14 @@
               (mkMerge [ (vm.disk "river" "esp") { frontendOpts.bootindex = 0; } ])
             ];
             hostDevices = {
-              et100g0vf1 = {
+              river-rdma = {
                 index = 0;
                 hostBDF = "44:00.2";
               };
+              river-dave = {
+                index = 1;
+                hostBDF = "44:00.5";
+              };
             };
           };
 
@@ -175,13 +189,14 @@
             networks = {
               netboot = {
                 bridge = "lan-lo";
+                ifname = "sfh-lo-tap";
                 waitOnline = "carrier";
                 mac = "52:54:00:a5:7e:93";
                 extraOptions.bootindex = 1;
               };
               core = {
                 bridge = "lan-core";
-                ifname = "vm-sfh-core";
+                ifname = "sfh-core-tap";
                 waitOnline = "carrier";
                 mac = "52:54:00:72:67:51";
               };
@@ -190,11 +205,11 @@
               (vm.lvmDisk' "hdds" "frigate")
             ];
             hostDevices = {
-              et100g0vf2 = {
+              sfh-hi = {
                 index = 0;
                 hostBDF = "44:00.3";
               };
-              et100g0vf3 = {
+              sfh-ctrs = {
                 index = 1;
                 hostBDF = "44:00.4";
               };