Upstream Caching (Epic #68-#75, #105):
- Add upstream_sources and cache_settings tables with migrations
- Add cache management API endpoints (CRUD for sources, settings)
- Add environment variable overrides for upstream sources and cache settings
- Add encryption module for storing credentials securely
- Add frontend Admin Cache Management page
- Add is_system field to projects for system cache distinction
- Add purge_seed_data for transitioning to production-like environments
CI Pipeline Refactoring:
- Remove reset jobs (reset_stage_pre, reset_stage)
- Add ephemeral orchard-test deployment for main branch testing
- Run integration tests on ephemeral deployment before promoting to stage
- Stage is now long-running pre-prod (smoke tests only)
- Disable prosper_setup for tag pipelines
