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.

scripts/install.sh

@@ -274,6 +274,11 @@ render_template "${PROJECT_DIR}/system/systemd/vacuum-wall-acme.service" \
     | install -m 0644 /dev/stdin /etc/systemd/system/vacuum-wall-acme.service
 
 install -m 0644 "${PROJECT_DIR}/system/systemd/vacuum-wall-acme.timer" /etc/systemd/system/vacuum-wall-acme.timer
+
+# Volatile /run entries (sudo, firewalld) must exist before vacuum-walld
+# spawns — systemd-tmpfiles-setup.service restores them at every boot.
+install -m 0644 "${PROJECT_DIR}/system/tmpfiles.d/vacuum-wall.conf" /etc/tmpfiles.d/vacuum-wall.conf
+systemd-tmpfiles --create
 systemctl daemon-reload
 
 # --- 7. Enable IP forwarding (persistent via sysctl.conf + runtime apply) ---