fix(dashboard): add aggregated resource usage stats to the dashboard

- Aggregate CPU, memory, and network stats across all running containers
- Extend ISystemStatus.docker with resource usage fields
- Fix getContainerStats Swarm service ID fallback
- Wire dashboard resource usage card to real backend data

ts/classes/docker.ts

@@ -596,18 +596,26 @@ export class OneboxDockerManager {
   async getContainerStats(containerID: string): Promise<IContainerStats | null> {
     try {
       // Try to get container directly first
-      let container = await this.dockerClient!.getContainerById(containerID);
+      let container: any = null;
+      try {
+        container = await this.dockerClient!.getContainerById(containerID);
+      } catch {
+        // Container not found by ID — might be a Swarm service ID
+      }
 
       // If not found, it might be a service ID - try to get the actual container ID
       if (!container) {
         const serviceContainerId = await this.getContainerIdForService(containerID);
         if (serviceContainerId) {
-          container = await this.dockerClient!.getContainerById(serviceContainerId);
+          try {
+            container = await this.dockerClient!.getContainerById(serviceContainerId);
+          } catch {
+            // Service container also not found
+          }
         }
       }
 
       if (!container) {
-        // Container/service not found
         return null;
       }