Fix Tailscale peer discovery in plugin installer — drop python3 dependency

python3 isn't installed on stock Unraid (confirmed absent on HOST1), so the
JSON-parsing pipeline silently produced zero peers every time, making the
Tailscale fallback tier a permanent no-op since it was written. Replaced with
plain 'tailscale status' + awk, matching the pattern common.sh already uses.

Plugin/varaverk.plg

@@ -150,10 +150,8 @@ if [[ ! -d "$SCRIPTS_DIR/.git" ]]; then
                 log "Gitea found on Tailscale peer $GITEA_IP"
                 break
             fi
-        done < <(tailscale status --json 2>/dev/null | \
-                 python3 -c "import json,sys; d=json.load(sys.stdin); \
-                 [print(v['TailscaleIPs'][0]) for v in d.get('Peer',{}).values() \
-                  if v.get('TailscaleIPs')]" 2>/dev/null)
+        done < <(tailscale status 2>/dev/null | \
+                 awk '{print $1}' | grep -E '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$')
     fi
 
     if [[ -z "$GITEA_IP" && -n "$GITEA_DOMAIN" ]]; then