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/mem.go

@@ -37,6 +37,8 @@ func (m *MemCollector) Collect() (model.MemoryStat, error) {
 	cachedKB := values["Cached"]
 	availableKB := values["MemAvailable"]
 	freeKB := values["MemFree"]
+	swapTotalKB := values["SwapTotal"]
+	swapFreeKB := values["SwapFree"]
 
 	// 若内核未提供 MemAvailable（较老版本），则按传统方式估算可用内存
 	if availableKB == 0 {
@@ -48,10 +50,18 @@ func (m *MemCollector) Collect() (model.MemoryStat, error) {
 		usedKB = totalKB - availableKB
 	}
 
+	// Swap used
+	swapUsedKB := uint64(0)
+	if swapTotalKB > swapFreeKB {
+		swapUsedKB = swapTotalKB - swapFreeKB
+	}
+
 	stat := model.MemoryStat{
-		TotalGB:  float64(totalKB) * kbToGB,
-		UsedGB:   float64(usedKB) * kbToGB,
-		CachedGB: float64(buffersKB+cachedKB) * kbToGB,
+		TotalGB:     float64(totalKB) * kbToGB,
+		UsedGB:      float64(usedKB) * kbToGB,
+		CachedGB:    float64(buffersKB+cachedKB) * kbToGB,
+		AvailableGB: float64(availableKB) * kbToGB,
+		SwapUsedGB:  float64(swapUsedKB) * kbToGB,
 	}
 	if totalKB > 0 {
 		stat.UsagePercent = float64(usedKB) / float64(totalKB) * 100.0