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/package.json

@@ -5,6 +5,8 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
+    "dev:local": "cross-env VITE_API_TARGET=http://localhost:8081 vite",
+    "dev:remote": "cross-env VITE_API_TARGET=http://192.168.50.86:30090 vite",
     "build": "tsc -p tsconfig.app.json --noEmit && vite build",
     "lint": "eslint .",
     "preview": "vite preview",
@@ -28,6 +30,7 @@
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.0",
+    "cross-env": "^10.1.0",
     "eslint": "^9.39.4",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.5.2",