Improve metrics clarity, exploration, and refresh reliability

src/routes/api/metrics/+server.ts

@@ -0,0 +1,9 @@
+import { json } from '@sveltejs/kit';
+import { parseMetricsDays } from '$lib/metrics.js';
+import { readMetrics } from '$lib/server/fleet/metrics.js';
+
+export function GET({ url }: { url: URL }) {
+    return json(readMetrics(parseMetricsDays(url.searchParams.get('days'))), {
+        headers: { 'cache-control': 'no-store' }
+    });
+}