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/issues.json

@@ -114,6 +114,7 @@
     }
   },
   "terminal": {
+    "launch": "Launch Session",
     "session": {
       "select": "Select session",
       "none": "No sessions",