feat: add AI quote processing pipeline and admin settings UI
Add complete end-to-end AI-powered quote extraction workflow:
- Disable PB SDK auto-cancellation to support parallel batch requests
- Add required runtime dependencies for AI processing and document parsing
- Implement AI settings backend, operator UI, and REST API routes
- Add quote ingestion, insight population, and manual re-run AI endpoints
- Build service layers for quote items, AI settings, and structured item insights
- Fix attachment upload handling and quote item history blob parsing
- Add supporting migrations, smoke tests, and shared utility functions
- Export previously private helper functions for cross-service reuse
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