Panel redesign, per-server I1 masking, node minimum version 0.5.0, installer output

- UI: settings tab with sections (server, API keys, Prometheus, audit, migrate,
  about); server settings moved there; master keys table rework (menu, chips,
  version, compact phone cards); three-state node version chip
- I1: random per-server template (DNS / QUIC Initial / STUN) kept in users.db,
  GET/POST /api/masking, change from the master keys banner
- Hub rejects nodes older than 0.5.0 (close 4026), /ui/nodes reports outdated
- install.sh: spinner for long commands (full output in the log), step progress
  bar, cards; installs older than 0.5.0 require a full reinstall with data reset
- Bump to Beta 0.5.0

awg-ui/src/tabs/settings/audit/audit.css

@@ -0,0 +1,39 @@
+/*
+Copyright (c) 2026 Ivan Vasilev
+This source code is licensed under the MIT license found in the
+LICENSE file in the root directory of this source tree.
+*/
+/* Стили вкладки «Аудит». Общая дизайн-система — в App.css. */
+
+.au-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
+.au-run { margin-left: auto; }
+.au-hint { font-size: var(--body-small-size); line-height: var(--body-small-line); color: var(--neutral-text); }
+.au-notice {
+    font-size: var(--body-medium-size); line-height: var(--body-medium-line); color: var(--on-error-container); background: var(--error-container);
+    border-radius: var(--shape-large); padding: 10px 16px; margin: 0;
+}
+.au-empty { font-size: var(--body-medium-size); line-height: var(--body-medium-line); color: var(--neutral-text); text-align: center; padding: 48px 0; }
+.au-pub { display: inline-block; max-width: 340px; overflow: hidden; text-overflow: ellipsis; vertical-align: middle; font-family: var(--mono); font-size: var(--body-small-size); line-height: var(--body-small-line); }
+.au-table td, .au-table th { white-space: nowrap; }
+
+/* мобильный: таблица скрыта (.table-card), то же — карточками */
+.au-cards { list-style: none; margin: 0; padding: 0; display: none; flex-direction: column; gap: 8px; }
+.au-card { display: flex; flex-direction: column; gap: 4px; background: var(--surface-container); border-radius: var(--shape-large); padding: 12px 16px; }
+.au-card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
+.au-card .au-pub { max-width: 100%; }
+@media (max-width: 839px) { .au-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); } }
+
+.au-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-left: auto; }
+.au-run { margin-left: 0; }
+
+.au-box { display: flex; flex-direction: column; gap: 10px; background: var(--surface-container); border-radius: var(--shape-large); padding: 12px 16px; }
+.au-box-title { margin: 0; font-size: var(--title-small-size); line-height: var(--title-small-line); font-weight: var(--weight-medium); }
+.au-setting { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
+.au-setting-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
+.au-setting-name { font-size: var(--body-medium-size); line-height: var(--body-medium-line); }
+.au-setting-ctl { display: inline-flex; align-items: center; gap: 8px; }
+.au-max { width: 88px !important; }
+.au-select { width: auto !important; }
+.au-log { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
+.au-log li { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-size: var(--body-medium-size); line-height: var(--body-medium-line); }
+.au-log .au-pub { max-width: 240px; }