snapshot: AlertCenter拆分前快照

backend/internal/models/k8s.go

@@ -193,3 +193,12 @@ type K8sClusterStats struct {
 	TotalPods     int64 `json:"total_pods"`
 	TotalServices int64 `json:"total_services"`
 }
+
+// TopologyLayout 拓扑布局（保存节点位置 + 自定义节点 + 自定义连线） // Logan.Li
+type TopologyLayout struct {
+	ID         uint      `gorm:"primarykey" json:"id"`
+	ClusterID  uint      `gorm:"uniqueIndex;not null" json:"cluster_id"`
+	LayoutData string    `gorm:"type:text" json:"layout_data"` // JSON: {positions, customNodes, customEdges}
+	CreatedAt  time.Time `json:"created_at"`
+	UpdatedAt  time.Time `json:"updated_at"`
+}