🎉 init: impl dashboard overview

src/lib/format.ts

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+export function formatBytes(bytes?: number, decimals = 2): string {
+  if (bytes === undefined || bytes === null || isNaN(bytes) || bytes === 0) return '0 B'
+  const k = 1024
+  const dm = decimals < 0 ? 0 : decimals
+  const sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB']
+  const i = Math.floor(Math.log(Math.abs(bytes)) / Math.log(k))
+  const idx = Math.min(i, sizes.length - 1)
+  return `${parseFloat((bytes / Math.pow(k, idx)).toFixed(dm))} ${sizes[idx]}`
+}
+
+export function formatSpeed(bps?: number, decimals = 2): string {
+  if (bps === undefined || bps === null || isNaN(bps) || bps === 0) return '0 B/s'
+  return `${formatBytes(bps, decimals)}/s`
+}
+
+export function formatPPS(pps?: number): string {
+  if (pps === undefined || pps === null || isNaN(pps) || pps === 0) return '0 PPS'
+  if (pps >= 1_000_000) {
+    return `${(pps / 1_000_000).toFixed(2)} M PPS`
+  }
+  if (pps >= 1_000) {
+    return `${(pps / 1_000).toFixed(2)} K PPS`
+  }
+  return `${Math.round(pps)} PPS`
+}
+
+/**
+ * 格式化时间延迟（核心协议与 Java 监控全部输出纳秒 ns）
+ * @param nanoDelay 纳秒 (ns)
+ */
+export function formatNanoDelay(nanoDelay?: number): string {
+  if (nanoDelay === undefined || nanoDelay === null || isNaN(nanoDelay) || nanoDelay <= 0) {
+    return '0 ns'
+  }
+  if (nanoDelay >= 1_000_000_000) {
+    return `${(nanoDelay / 1_000_000_000).toFixed(2)} s`
+  }
+  if (nanoDelay >= 1_000_000) {
+    return `${(nanoDelay / 1_000_000).toFixed(2)} ms`
+  }
+  if (nanoDelay >= 1_000) {
+    return `${(nanoDelay / 1_000).toFixed(1)} μs`
+  }
+  return `${Math.round(nanoDelay)} ns`
+}
+
+/**
+ * 格式化背板延迟（以微秒/纳秒为主要显示单位）
+ * @param nanoTime 纳秒 (ns)
+ */
+export function formatBackplaneDelay(nanoTime?: number): string {
+  if (nanoTime === undefined || nanoTime === null || isNaN(nanoTime) || nanoTime <= 0) {
+    return '0.0 μs'
+  }
+  if (nanoTime >= 1_000_000) {
+    return `${(nanoTime / 1_000_000).toFixed(2)} ms`
+  }
+  return `${(nanoTime / 1_000).toFixed(1)} μs`
+}
+
+export function formatPercent(rate?: number): string {
+  if (rate === undefined || rate === null || isNaN(rate)) return '0.0%'
+  return `${(rate * 100).toFixed(2)}%`
+}