feat(xray/dns): align DNS settings with Xray docs + UI polish

- DNS server modal: rename expectIPs -> expectedIPs (per docs); add
  per-server tag, clientIP, serveStale, serveExpiredTTL, timeoutMs;
  flip skipFallback default to false; hydration still accepts legacy
  expectIPs for back-compat.
- DNS tab: add hosts editor (domain -> IP/array), serveStale +
  serveExpiredTTL controls, "Use Preset" button bringing back the
  legacy preset gallery (Google / Cloudflare / AdGuard + Family
  variants — fixed AdGuard Family IPs that were wrong in legacy),
  and a "Delete All" button to wipe the server list at once.
- i18n: add 15 new dns.* keys across all 13 locales.
- Frontend-wide formatter pass on Vue components (whitespace and
  attribute layout only, no behavior changes).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/pages/settings/SecurityTab.vue

@@ -221,12 +221,7 @@ function toggleTwoFactor() {
         <template #title>{{ t('pages.nodes.apiToken') }}</template>
         <template #description>{{ t('pages.nodes.apiTokenHint') }}</template>
         <template #control>
-          <a-input-password
-            :value="apiToken"
-            readonly
-            :loading="apiTokenLoading"
-            style="min-width: 240px"
-          />
+          <a-input-password :value="apiToken" readonly :loading="apiTokenLoading" style="min-width: 240px" />
         </template>
       </SettingListItem>
       <a-list-item>