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/disk.go

@@ -76,12 +76,22 @@ func (d *DiskCollector) Collect() ([]model.DiskStat, error) {
 		}
 		used := total - free
 
+		// inode 使用率
+		var inodePct float64
+		if fs.Files > 0 {
+			inodePct = float64(fs.Files-fs.Ffree) / float64(fs.Files) * 100.0
+			if inodePct < 0 {
+				inodePct = 0
+			}
+		}
+
 		disks = append(disks, model.DiskStat{
-			Mount:        m.mountpoint,
-			Device:       m.device,
-			TotalGB:      bytesToGB(total),
-			UsedGB:       bytesToGB(used),
-			UsagePercent: float64(used) / float64(total) * 100.0,
+			Mount:         m.mountpoint,
+			Device:        m.device,
+			TotalGB:       bytesToGB(total),
+			UsedGB:        bytesToGB(used),
+			UsagePercent:  float64(used) / float64(total) * 100.0,
+			InodeUsagePct: inodePct,
 		})
 	}
 	return disks, nil