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/inbounds/ClientFormModal.vue

@@ -362,7 +362,7 @@ const title = computed(() =>
       <a-form-item v-else>
         <template #label>
           <a-tooltip :title="t('pages.inbounds.leaveBlankToNeverExpire')">{{ t('pages.inbounds.expireDate')
-            }}</a-tooltip>
+          }}</a-tooltip>
         </template>
         <DateTimePicker v-model:value="expiryDate" />
         <a-tag v-if="mode === 'edit' && isExpired" color="red">{{ t('depleted') }}</a-tag>