feat(k8s): M14 Namespace 管理看板（资源配额 + 命名空间 CRUD）

- 后端: ListNamespacesDetailed/CreateNamespace/DeleteNamespace/ListResourceQuotas/ListLimitRanges
- 后端: GetNamespacesDetail handler (6 API calls aggregate, not N×3)
- 后端: CreateNamespaceHandler + DeleteNamespaceHandler (system NS protection)
- 前端: NamespaceManagementPage.tsx (~280行) — 表格+概览卡片+创建/删除弹框
- 路由: GET/POST/DELETE /:clusterCode/namespaces + GET /namespace/:ns/detail
- 验证: 9/9 通过 (urllib), TS 零错误, Vite 构建成功

agent/collector/diskio.go

@@ -1,5 +1,5 @@
 // Package collector — 磁盘 IO 指标采集器
-// 通过读取 /proc/diskstats 获取磁盘读写 BPS 和 IOPS。
+// 通过读取 /proc/diskstats 获取磁盘读写 BPS、IOPS 和 util（磁盘繁忙程度）。
 //
 // 署名 Hermes
 package collector
@@ -23,6 +23,7 @@ type diskIOSample struct {
 	writeSects uint64
 	readOps    uint64
 	writeOps   uint64
+	ioTicks    uint64 // io_ticks (field 12) — 磁盘忙碌的毫秒累计
 }
 
 // DiskIOCollector 磁盘 IO 采集器
@@ -40,7 +41,7 @@ func NewDiskIOCollector() *DiskIOCollector {
 func (c *DiskIOCollector) Collect() (model.DiskIOStat, error) {
 	stat := model.DiskIOStat{}
 
-	rSects, wSects, rOps, wOps, err := readDiskStats()
+	rSects, wSects, rOps, wOps, ioTicks, err := readDiskStats()
 	if err != nil {
 		return stat, fmt.Errorf("读取磁盘 IO 失败: %w", err)
 	}
@@ -55,6 +56,7 @@ func (c *DiskIOCollector) Collect() (model.DiskIOStat, error) {
 		writeSects: wSects,
 		readOps:    rOps,
 		writeOps:   wOps,
+		ioTicks:    ioTicks,
 	}
 
 	if c.prev != nil && now.After(c.prev.time) {
@@ -65,6 +67,15 @@ func (c *DiskIOCollector) Collect() (model.DiskIOStat, error) {
 			stat.WriteBPS = float64((cur.writeSects-c.prev.writeSects)*sectorSize) / elapsed
 			stat.ReadIOPS = float64(cur.readOps-c.prev.readOps) / elapsed
 			stat.WriteIOPS = float64(cur.writeOps-c.prev.writeOps) / elapsed
+			// util% = io_ticks_delta_ms / (elapsed_ms) * 100
+			ioDelta := cur.ioTicks - c.prev.ioTicks
+			stat.Util = float64(ioDelta) / (elapsed * 1000.0) * 100.0
+			if stat.Util > 100 {
+				stat.Util = 100
+			}
+			if stat.Util < 0 {
+				stat.Util = 0
+			}
 		}
 	}
 	c.prev = cur
@@ -73,11 +84,11 @@ func (c *DiskIOCollector) Collect() (model.DiskIOStat, error) {
 }
 
 // readDiskStats 读取 /proc/diskstats，汇总所有物理磁盘的读写数据
-// fields[2]=设备名, fields[3]=读完成次数, fields[5]=读扇区数, fields[7]=写完成次数, fields[9]=写扇区数
-func readDiskStats() (rSects, wSects, rOps, wOps uint64, err error) {
+// fields[2]=设备名, fields[3]=读完成次数, fields[5]=读扇区数, fields[7]=写完成次数, fields[9]=写扇区数, fields[12]=io_ticks
+func readDiskStats() (rSects, wSects, rOps, wOps, ioTicks uint64, err error) {
 	f, err := os.Open("/proc/diskstats")
 	if err != nil {
-		return 0, 0, 0, 0, err
+		return 0, 0, 0, 0, 0, err
 	}
 	defer f.Close()
 
@@ -103,6 +114,7 @@ func readDiskStats() (rSects, wSects, rOps, wOps uint64, err error) {
 		// field 5 = 读扇区数 (rd_sectors)
 		// field 7 = 写完成次数 (wr_ios)
 		// field 9 = 写扇区数 (wr_sectors)
+		// field 12 = io_ticks (milliseconds spent doing I/O)
 		if v, e := strconv.ParseUint(fields[3], 10, 64); e == nil {
 			rOps += v
 		}
@@ -115,7 +127,10 @@ func readDiskStats() (rSects, wSects, rOps, wOps uint64, err error) {
 		if v, e := strconv.ParseUint(fields[9], 10, 64); e == nil {
 			wSects += v
 		}
+		if v, e := strconv.ParseUint(fields[12], 10, 64); e == nil {
+			ioTicks += v
+		}
 	}
 
-	return rSects, wSects, rOps, wOps, scanner.Err()
+	return rSects, wSects, rOps, wOps, ioTicks, scanner.Err()
 }