feat(notifications): deep-link bell rows to source stack and container logs (#692)

Add stack_name and container_name columns to notification_history so bell
rows can act as jump points. Producers (AutoHeal, Docker events) pass the
container context through dispatchAlert; the panel renders routable rows
as buttons that load the target stack and, when a container name is
present, open its logs modal. Non-structural notifications stay as
passive display rows.

frontend/src/components/dashboard/types.ts

@@ -51,6 +51,8 @@ export interface NotificationItem {
   is_read: number;
   nodeId?: number;
   nodeName?: string;
+  stack_name?: string;
+  container_name?: string;
 }
 
 export interface StackStatusEntry {