perf: réduire la fréquence de polling — data 2 min, statut 60s

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

src/App.tsx

@@ -117,7 +117,7 @@ export default function App() {
     };
 
     load(true);
-    const interval = setInterval(() => load(false), 30_000);
+    const interval = setInterval(() => load(false), 120_000);
 
     return () => { cancelled = true; clearInterval(interval); };
   }, [periodDays, endpointVersion]);