feat: make each plugin an npm workspace built by a termix-plugin CLI

plugins/host-metrics/src/frontend/metrics-change-key.ts

@@ -0,0 +1,24 @@
+import type { ServerMetrics } from "@/main-axios";
+
+/**
+ * Coarse fingerprint of a metrics poll. Adaptive polling backs off while it
+ * stays the same, so it must move whenever something a card shows changes.
+ */
+export function metricsChangeKey(data: ServerMetrics): string {
+  const bucket = (value: number | null | undefined) =>
+    value == null ? null : Math.round(value / 5) * 5;
+  return JSON.stringify({
+    cpu: bucket(data.cpu.percent),
+    memory: bucket(data.memory.percent),
+    disk: bucket(data.disk.percent),
+    running: data.processes?.running ?? null,
+    ports: data.ports?.ports?.length ?? 0,
+    firewall: data.firewall?.status ?? null,
+    gpus:
+      data.gpu?.gpus?.map((gpu) => [
+        bucket(gpu.utilizationPercent),
+        bucket(gpu.memoryPercent),
+      ]) ?? [],
+    gpuProcesses: data.gpu?.processes?.length ?? 0,
+  });
+}