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/nftables/module.json

@@ -6,7 +6,7 @@
   ],
   "claims": [
     {
-      "name": "the-packet-filter",
+      "name": "node-packet-filter",
       "scope": "node"
     }
   ],
@@ -30,7 +30,7 @@
       "id": "stock-unit-stop",
       "type": "file",
       "path": "/etc/systemd/system/nftables.service.d/mesh.conf",
-      "content": "# The mesh: stopping the stock unit deletes only the mesh's table, never the whole ruleset\n# (novox/hq ADR 0100) — a flush would take the container runtime's rules and any firewall with it.\n[Service]\nExecStop=\nExecStop=nft delete table inet mesh\n",
+      "content": "# The mesh: stopping the stock unit deletes only the mesh's table, never the whole ruleset\n# (novox/hq ADR 0100) \u2014 a flush would take the container runtime's rules and any firewall with it.\n[Service]\nExecStop=\nExecStop=nft delete table inet mesh\n",
       "mode": "0644"
     },
     {