fix: add /deployments redirect and fix GC Pauses chart X-axis

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ui/src/pages/AgentInstance/AgentInstance.tsx

@@ -111,7 +111,7 @@ export default function AgentInstance() {
   const gcSeries = useMemo(() => {
     const pts = jvmMetrics?.metrics?.['jvm.gc.time'];
     if (!pts?.length) return null;
-    return [{ label: 'GC ms', data: pts.map((p: any) => ({ x: String(p.time ?? ''), y: p.value })) }];
+    return [{ label: 'GC ms', data: pts.map((p: any, i: number) => ({ x: i, y: p.value })) }];
   }, [jvmMetrics]);
 
   const throughputSeries = useMemo(