feat: migrate UI to @cameleer/design-system, add backend endpoints

Backend:
- Add agent_events table (V5) and lifecycle event recording
- Add route catalog endpoint (GET /routes/catalog)
- Add route metrics endpoint (GET /routes/metrics)
- Add agent events endpoint (GET /agents/events-log)
- Enrich AgentInstanceResponse with tps, errorRate, activeRoutes, uptimeSeconds
- Add TimescaleDB retention/compression policies (V6)

Frontend:
- Replace custom Mission Control UI with @cameleer/design-system components
- Rebuild all pages: Dashboard, ExchangeDetail, RoutesMetrics, AgentHealth,
  AgentInstance, RBAC, AuditLog, OIDC, DatabaseAdmin, OpenSearchAdmin, Swagger
- New LayoutShell with design system AppShell, Sidebar, TopBar, CommandPalette
- Consume design system from Gitea npm registry (@cameleer/design-system@0.0.1)
- Add .npmrc for scoped registry, update Dockerfile with REGISTRY_TOKEN arg

CI:
- Pass REGISTRY_TOKEN build-arg to UI Docker build step

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

ui/src/auth/OidcCallback.tsx

@@ -1,7 +1,7 @@
 import { useEffect, useRef } from 'react';
 import { Navigate, useNavigate } from 'react-router';
 import { useAuthStore } from './auth-store';
-import styles from './LoginPage.module.css';
+import { Card, Spinner, Alert, Button } from '@cameleer/design-system';
 
 export function OidcCallback() {
   const { isAuthenticated, loading, error, loginWithOidcCode } = useAuthStore();
@@ -36,29 +36,21 @@ export function OidcCallback() {
   if (isAuthenticated) return <Navigate to="/" replace />;
 
   return (
-    <div className={styles.page}>
-      <div className={styles.card}>
-        <div className={styles.logo}>
-          <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
-            <path d="M12 2C6.5 2 2 6.5 2 12s4.5 10 10 10 10-4.5 10-10S17.5 2 12 2" />
-            <path d="M12 6v6l4 2" />
-          </svg>
-          cameleer3
+    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '100vh', background: 'var(--surface-ground)' }}>
+      <Card>
+        <div style={{ padding: '2rem', textAlign: 'center', minWidth: 320 }}>
+          <h2 style={{ marginBottom: '1rem' }}>cameleer3</h2>
+          {loading && <Spinner />}
+          {error && (
+            <>
+              <Alert variant="error">{error}</Alert>
+              <Button variant="secondary" onClick={() => navigate('/login')} style={{ marginTop: 16 }}>
+                Back to Login
+              </Button>
+            </>
+          )}
         </div>
-        {loading && <div className={styles.subtitle}>Completing sign-in...</div>}
-        {error && (
-          <>
-            <div className={styles.error}>{error}</div>
-            <button
-              className={styles.submit}
-              style={{ marginTop: 16 }}
-              onClick={() => navigate('/login')}
-            >
-              Back to Login
-            </button>
-          </>
-        )}
-      </div>
+      </Card>
     </div>
   );
 }