Add dns_txt, webrtc_mesh, and wsus_cache_peer LOTL deploy tiers with Forge toggles.

Implements three new spread lanes following the do_peer pattern: DNS TXT mesh staging, WebRTC LAN seed manifest delivery, and WSUS SoftwareDistribution cousin handoff. Integrates tiers into onion chain, deploy-plan allowlist, Forge UI/docs, and tests.

server/web/src/pages/EmberwakePage.tsx

@@ -23,7 +23,6 @@ import AlsoHere from '../components/Presence/AlsoHere';
 import ComradeAvatar from '../components/Presence/ComradeAvatar';
 import SupplyChainExportWizard from '../components/Emberwake/SupplyChainExportWizard';
 import { HelpTip } from '../components/HelpTip';
-import './Pages.css';
 import './EmberwakePage.css';
 import '../components/Presence/Presence.css';