feat: replace UI with design system example pages wired to real API

Migrate all page components from the @cameleer/design-system v0.0.3
example UI, replacing mock data with real backend API hooks. This brings
richer visuals (KpiStrip, GroupCard, RouteFlow, ProcessorTimeline,
DateRangePicker, expandable rows) while preserving all existing API
integration, auth, and routing infrastructure.

Pages migrated: Dashboard, RoutesMetrics, RouteDetail, ExchangeDetail,
AgentHealth, AgentInstance, OidcConfig, AuditLog, RBAC (Users/Groups/Roles).
Also enhanced LayoutShell CommandPalette with real search data from catalog.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/AuditLogPage.module.css

@@ -0,0 +1,86 @@
+.filters {
+  display: flex;
+  gap: 10px;
+  flex-wrap: wrap;
+  margin-bottom: 16px;
+}
+
+.filterInput {
+  width: 200px;
+}
+
+.filterSelect {
+  width: 160px;
+}
+
+.tableSection {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  overflow: hidden;
+}
+
+.tableHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border-subtle);
+}
+
+.tableTitle {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.tableRight {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.tableMeta {
+  font-size: 11px;
+  color: var(--text-muted);
+}
+
+.target {
+  display: inline-block;
+  max-width: 220px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.expandedDetail {
+  padding: 4px 0;
+}
+
+.detailGrid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 12px;
+  margin-bottom: 12px;
+}
+
+.detailField {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.detailLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.8px;
+  color: var(--text-muted);
+  font-family: var(--font-body);
+}
+
+.detailValue {
+  font-size: 12px;
+  color: var(--text-secondary);
+}