feat(demo): mock FIPS as active (status, seed anchors, reconnect, install)

fips.status reports installed+active with 5 authenticated peers and an anchor
connection; list/add/remove/apply seed-anchors and reconnect/install all resolve
to working states so the FIPS Mesh + Seed Anchors cards light green in the demo.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neode-ui/mock-backend.js

@@ -1917,6 +1917,52 @@ app.post('/rpc/v1', (req, res) => {
         return res.json({ result: { paid: true, status: 'confirmed', confirmations: 1 } })
       }
 
+      // ── FIPS encrypted-mesh transport (shows as fully active in the demo) ──
+      case 'fips.status': {
+        return res.json({
+          result: {
+            installed: true,
+            version: '0.4.2',
+            service_state: 'active',
+            upstream_service_state: 'active',
+            service_active: true,
+            key_present: true,
+            npub: 'npub1' + randomHex(28),
+            authenticated_peer_count: 5,
+            anchor_connected: true,
+          },
+        })
+      }
+      case 'fips.list-seed-anchors': {
+        return res.json({
+          result: {
+            seed_anchors: [
+              { npub: 'npub1' + randomHex(28), address: 'fips.v0l.io:8443', transport: 'tcp', label: 'Public anchor' },
+              { npub: 'npub1' + randomHex(28), address: 'anchor.archipelago.lan:8443', transport: 'tcp', label: 'Federation anchor' },
+            ],
+          },
+        })
+      }
+      case 'fips.add-seed-anchor':
+      case 'fips.remove-seed-anchor': {
+        const seed = [
+          { npub: 'npub1' + randomHex(28), address: params?.address || 'fips.v0l.io:8443', transport: 'tcp', label: params?.label || 'Anchor' },
+        ]
+        return res.json({ result: { seed_anchors: seed, apply: [{ npub: seed[0].npub, ok: true, message: 'applied' }] } })
+      }
+      case 'fips.apply-seed-anchors': {
+        return res.json({ result: { applied: 2, results: [
+          { npub: 'npub1' + randomHex(28), ok: true, message: 'connected' },
+          { npub: 'npub1' + randomHex(28), ok: true, message: 'connected' },
+        ] } })
+      }
+      case 'fips.reconnect': {
+        return res.json({ result: { success: true, anchor_connected: true, authenticated_peer_count: 5 } })
+      }
+      case 'fips.install': {
+        return res.json({ result: { success: true, installed: true, version: '0.4.2' } })
+      }
+
       case 'network.diagnostics': {
         return res.json({
           result: {