fix: D3FEND expandable cards, System page cleanup, and multi-source improvements

- Make D3FEND defense cards clickable with expandable details and external link
- Fix D3FEND URLs to use PascalCase technique names matching the ontology
- Remove duplicate Import Atomic Red Team from System page (use Data Sources)
- Add bulk Activate All / Deactivate All buttons with confirmation modal
- Fix template admin list to show both active and inactive templates
- Add PATCH /test-templates/bulk-activate backend endpoint
- Auto-seed data sources on container startup via entrypoint.sh
- Fix SigmaHQ, CALDERA, GTFOBins import issues
- Register D3FEND sync handler in data sources router
- Add CIS Controls v8 compliance framework import
- Expand Test Catalog source filters (CALDERA, LOLBAS, GTFOBins)
- Campaign Generate from Threat Actor now opens actor selector modal
- Add coverage snapshot creation button to Comparison page
- Update README with accurate data source and feature documentation

backend/entrypoint.sh

@@ -7,5 +7,8 @@ alembic upgrade head
 echo "=== Seeding admin user ==="
 python -m app.seed
 
+echo "=== Seeding data sources ==="
+python -m app.seed_data_sources
+
 echo "=== Starting uvicorn ==="
 exec uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload