Rename NWC feature to Lightning Wallet Connections and split modal into tabs

Naming: user-facing 'Wallet Connections' -> 'Lightning Wallet Connections'
across the Hub, feature registry, tile, and NixOS modules. Internal ids
(nwc-wallets, albyhub.service, /api/nwc/*) are unchanged.

UX: the service-detail modal put status, domain diagnostics, router ports,
the enable/disable toggle, restart, the liquidity guide and the whole wallet
manager in one cramped scrolling column. For this feature the modal is now
980px wide and split into two tabs:

  - Wallets: wallet grid, create/share/verify flows, collapsible liquidity guide
  - Service & Setup: description, status, domain checklist, ports, enable, restart

A status dot and domain chip sit in the tab bar so state is visible from both
tabs, and the modal opens on Setup when the service is off or the Lightning
Address domain is unconfigured. Wallet cards gain a balance chip, pending
badge, a prominent address row, and separated destructive actions.

Non-NWC services keep the original single-column layout and width.

Co-authored-by: arena-agent <297053741+arena-agent@users.noreply.github.com>

app/sovran_systemsos_web/static/js/features.js

@@ -77,7 +77,7 @@ function openDomainSetupModal(feat, onSaved) {
 
   var nwcWarning = isWalletConnections
     ? '<div class="domain-nwc-warning">' +
-      '<strong>⚠ Wallet Connections requires its own unique hostname.</strong> ' +
+      '<strong>⚠ Lightning Wallet Connections requires its own unique hostname.</strong> ' +
       'Use a new subdomain such as <code>lightning.yourdomain.com</code>, or a separate domain. ' +
       'Do not reuse a domain already assigned to Matrix, Nextcloud, WordPress, BTCPay Server, Vaultwarden, Haven, or another Caddy site.' +
       '</div>'
@@ -194,7 +194,7 @@ function openDomainReconfigureModal(feat, existingDomain, onSaved) {
 
   var nwcWarning = isWalletConnections
     ? '<div class="domain-nwc-warning">' +
-      '<strong>⚠ Wallet Connections requires its own unique hostname.</strong> ' +
+      '<strong>⚠ Lightning Wallet Connections requires its own unique hostname.</strong> ' +
       'Use a new subdomain such as <code>lightning.yourdomain.com</code>, or a separate domain. ' +
       'Do not reuse a domain already assigned to Matrix, Nextcloud, WordPress, BTCPay Server, Vaultwarden, Haven, or another Caddy site.' +
       '</div>'