fix: correct pve1 IP to 10.42.0.4, rename stale joel/opnsense refs

pve1 is a static/DHCP-reserved Proxmox host at 10.42.0.4 (previously
mislabeled 'joel' in some places). 10.42.1.1 is the UDM Pro gateway
IP, not pve1 -- OPNsense was retired in favor of Ubiquiti. Removes
the stale duplicate PVE1 DHCP reservation at 10.42.1.1 and drops the
now-redundant 'joel' entry from network.json (consolidated into
pve1).

network.json

@@ -135,9 +135,6 @@
       "pubkey": "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILFYyzz/9i5rXprCQj9IL1ulrbQ6E9BOSeOcvf4D/b0G",
       "tags": ["server"]
     },
-    "joel": {
-      "ip": "10.42.0.4"
-    },
     "k3s": {
       "aliases": ["*.k3s"],
       "ip": "10.42.5.1",
@@ -151,6 +148,9 @@
     "printer": {
       "ip": "10.42.1.3"
     },
+    "pve1": {
+      "ip": "10.42.0.4"
+    },
     "pve2": {
       "ip": "10.42.1.15"
     },