- contracts: Add #[api_dto] macros to core structs for OpenAPI support
- api-gateway: Integrate utoipa for Swagger UI and OpenAPI spec generation
- config: Implement dynamic configuration APIs for DataSources and LLM Providers
- tests: Refactor E2E tests to support dynamic provider configuration and fix timeouts
- docs: Update backend status in backend_todos.md
- Fix `simple_test_analysis` template in E2E test setup to align with Orchestrator's data fetch logic.
- Implement and verify additional E2E scenarios:
- Scenario C: Partial Provider Failure (verified error propagation fix in Orchestrator).
- Scenario D: Invalid Symbol input.
- Scenario E: Analysis Module failure.
- Update `WorkflowStateMachine::handle_report_failed` to correctly scope error broadcasting to the specific task instead of failing effectively silently or broadly.
- Update testing strategy documentation to reflect completed Phase 4 testing.
- Skip Scenario B (Orchestrator Restart) as persistence is not yet implemented (decision made to defer persistence).
