Rename seat claims to the mesh-*/node-* convention; retire verdaccio (ADR 0121)

Claims renamed to match the controller's seat set: node-dns-resolver (dnsmasq),
node-intrusion-prevention (fail2ban), node-packet-filter (nftables),
node-resolver-config (resolv-conf, resolved-split-dns), node-uplink
(networkmanager, systemd-networkd, dhcpcd), mesh-build-machine (builder, +mesh
scope), mesh-catalog (mesh-catalog). showcase now declares its own seat and
claims it. verdaccio removed — the mesh keeps distribution as its registry and
gitea already serves npm, so a second npm registry is redundant.

modules/builder/module.json

@@ -6,8 +6,8 @@
   ],
   "claims": [
     {
-      "name": "the-build-machine",
-      "scope": "node"
+      "name": "mesh-build-machine",
+      "scope": "mesh"
     }
   ],
   "requires": [