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/app/seed_data_sources.py

@@ -41,8 +41,8 @@ INITIAL_SOURCES = [
                        "3 000+ rules with MITRE ATT&CK mappings.",
         "sync_frequency": "weekly",
         "config": {
-            "zip_url": "https://github.com/SigmaHQ/sigma/archive/refs/heads/main.zip",
-            "root_prefix": "sigma-main",
+            "zip_url": "https://github.com/SigmaHQ/sigma/archive/refs/heads/master.zip",
+            "root_prefix": "sigma-master",
             "rules_dir": "rules",
         },
     },
@@ -78,13 +78,14 @@ INITIAL_SOURCES = [
         "name": "caldera",
         "display_name": "MITRE CALDERA",
         "type": "attack_procedure",
-        "url": "https://github.com/mitre/caldera",
+        "url": "https://github.com/mitre/stockpile",
         "description": "Automated adversary emulation platform by MITRE. "
-                       "400+ abilities (executable actions) mapped to ATT&CK.",
+                       "400+ abilities (executable actions) mapped to ATT&CK "
+                       "(via the Stockpile plugin).",
         "sync_frequency": "monthly",
         "config": {
-            "zip_url": "https://github.com/mitre/caldera/archive/refs/heads/master.zip",
-            "root_prefix": "caldera-master",
+            "zip_url": "https://github.com/mitre/stockpile/archive/refs/heads/master.zip",
+            "root_prefix": "stockpile-master",
             "abilities_dir": "data/abilities",
         },
     },