Add orchestrator types and error handling configurations

- Introduced new TypeScript types for orchestrator functionality, including `SessionStrategy`, `ErrorHandlingStrategy`, and `OrchestrationStep`.
- Defined interfaces for `OrchestrationPlan` and `ManualOrchestrationParams` to facilitate orchestration management.
- Added a new PNG image file for visual representation.
- Created a placeholder file named 'nul' for future use.

ccw/frontend/src/locales/en/orchestrator.json

@@ -29,6 +29,15 @@
     "completed": "Completed",
     "failed": "Failed"
   },
+  "controlPanel": {
+    "progress": "{completed}/{total} steps",
+    "noPlan": "No orchestration plan found",
+    "completedMessage": "Orchestration completed successfully",
+    "failedMessage": "Orchestration stopped",
+    "cancelled": "Cancelled",
+    "retry": "Retry",
+    "skip": "Skip"
+  },
   "node": {
     "title": "Node",
     "nodes": "Nodes",