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.

daemon/handlers/nginx.py

@@ -150,6 +150,9 @@ def _get_config() -> dict[str, Any]:
     cfg, changed = _migrate_config(raw)
     if changed:
         _save_config(cfg)
+        # The on-disk config format changed under the state store's feet;
+        # re-collect so cached state (e.g. the domains list) matches the file.
+        refresh_state(["nginx"])
     return cfg
 
 
@@ -172,6 +175,9 @@ def _get_backends() -> dict[str, Any]:
         backends["webui"]["_migrated"] = True
         cfg["backends"] = backends
         _save_config(cfg)
+        # Config file was rewritten (builtin backend materialized); re-collect
+        # so cached state matches the file.
+        refresh_state(["nginx"])
     return backends