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_web/elements/ob-view-dashboard.ts

@@ -110,8 +110,8 @@ export class ObViewDashboard extends DeesElement {
             cpu: status?.docker?.cpuUsage || 0,
             memoryUsed: status?.docker?.memoryUsage || 0,
             memoryTotal: status?.docker?.memoryTotal || 0,
-            networkIn: 0,
-            networkOut: 0,
+            networkIn: status?.docker?.networkIn || 0,
+            networkOut: status?.docker?.networkOut || 0,
             topConsumers: [],
           },
           platformServices: platformServices.map((ps) => ({