Resolve miscellaneous TODO items in BFF API services

[spaarke-dev]

Context

Several individual TODO comments across BFF API services track specific deferred work items.

Items

1. AnalysisAuthorizationFilter.cs:203 - Look up sprk_analysisoutput to find associated document ID
2. EmailEndpoints.cs:524 - Queue AI processing job for documentId and attachment documents
3. ChatEndpoints.cs:832 - PH-112-A: Full context-aware refinement (editor surrounding context)
4. DocumentCheckoutService.cs:893 - Implement when we have the full web URL from Graph
5. AnalysisOrchestrationService.cs:433 - Extract CreatedBy from context when Dataverse integration complete
6. PlaybookOrchestrationService.cs:695 - Check sprk_continueonerror field per node (Phase 4)
7. OutputOrchestratorService.cs:321 - Determine where outputMapping is stored in playbook entity
8. DataverseIndexSyncService.cs:388 - Expand lookups to get organization/people names
9. AiAnalysisNodeExecutor.cs:652 - Document and RagIndex types resolved in PlaybookOrchestrationService
10. VisualizationService.cs:1014 - Add parent entity lookup when available
11. VisualizationService.cs:1108 - Track cache hits when implemented
12. IndexingWorkerHostedService.cs:30 - Integrate with actual IndexingWorker.ProcessAsync()
13. ProfileSummaryWorker.cs:26 - Implement AI summary generation
14. DataverseServiceClientImpl.cs:1195,1277 - Re-enable document lookup after fix
15. OfficeService.cs:1939 - Make base URL configurable via appsettings

Source: Code quality audit task 031.