fix: daemon /run spawn hardening, auth guard before first paint, WS refresh cap, interfaces runtime state

systemd: pre-create volatile /run paths so vacuum-walld's ProtectSystem=strict namespace setup cannot fail with 226/NAMESPACE — RuntimeDirectory=vacuum-wall nginx plus a tmpfiles.d spec (installed to /etc/tmpfiles.d/) covering /run/firewalld and /run/nginx.pid. Drop /run/sudo from ReadWritePaths: NOPASSWD children never need it, and its absence crash-looped restarts after sudo removed /run/sudo.

webui: run the auth session check before mounting the shell so logged-out visitors never flash the sidebar or a protected page; router guard and sidebar now react to auth state, and the login page renders full-bleed.

ws: cap refresh->reconnect episodes at 2 consecutive failures; if the WS path stays dead after a token refresh, abandon reconnection instead of looping refreshAuth forever (UI keeps working via REST until reload).

api: GET /api/network/interfaces now includes loopback and returns per-interface {config, runtime}; dashboard reads runtime.state (carrier counts as up) and the interfaces page filters lo client-side.

daemon: re-collect nginx state after lazy config migration (cached list went stale when the on-disk format changed under it), skip system_import.nginx when config.json already exists (re-parsing vacuum-wall's own generated sites is lossy), and poll nginx (60s) / acme (300s) state so file drift self-heals.

webui/static/pages/interfaces.js

@@ -52,7 +52,8 @@ export default definePage({
         const zones = fwZones.available || [];
         const activeZones = fwZones.active || {};
 
-        const ifaces = Object.entries(netData).map(([name, entry]) => {
+        // Loopback has no networkd config to manage — show real NICs only.
+        const ifaces = Object.entries(netData).filter(([name]) => name !== 'lo').map(([name, entry]) => {
             let zone = null;
             for (const [zoneName, zIfaces] of Object.entries(activeZones)) {
                 if ((zIfaces || []).includes(name)) {