fix: align all pages with design system mocks — stat cards, tables, detail panels

Dashboard: correct stat card labels (Exchanges/Success Rate/Errors/Throughput/Latency p99),
add detail text, trends, sparklines on all cards, Agent column, LIVE badge,
expanded detail panel with Agent/Correlation/Timestamp, "Open full details" link.

Agent Health: per-group meta (TPS/routes) in GroupCard header, proper HTML table
with column headers for instance list.

Agent Instance: stat card detail props (heap info, start date), scope trail with
inline status/version/routes badges.

Routes: 5th In-Flight stat card, enriched stat card props (detail/trend/sparkline),
SLA threshold line on latency chart.

Exchange Detail: Agent stat box in header.

Also: vite proxy CORS fix, cross-env dev scripts.

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

ui/src/pages/Dashboard/Dashboard.module.css

@@ -82,3 +82,19 @@
   flex-shrink: 0;
   padding-top: 2px;
 }
+
+.openDetailLink {
+  display: inline-block;
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--accent, #c6820e);
+  cursor: pointer;
+  background: none;
+  border: none;
+  padding: 0;
+  text-decoration: none;
+}
+
+.openDetailLink:hover {
+  text-decoration: underline;
+}