feat(phase-24): integrate MITRE D3FEND defensive techniques with ATT&CK mapping (T-213, T-214)

backend/app/models/__init__.py

@@ -10,11 +10,13 @@ from app.models.notification import Notification
 from app.models.data_source import DataSource
 from app.models.detection_rule import DetectionRule
 from app.models.threat_actor import ThreatActor, ThreatActorTechnique
+from app.models.defensive_technique import DefensiveTechnique, DefensiveTechniqueMapping
 from app.models.enums import TechniqueStatus, TestState, TestResult, TeamSide
 
 __all__ = [
     "User", "Technique", "Test", "TestTemplate", "Evidence",
     "IntelItem", "AuditLog", "Notification", "DataSource",
     "DetectionRule", "ThreatActor", "ThreatActorTechnique",
+    "DefensiveTechnique", "DefensiveTechniqueMapping",
     "TechniqueStatus", "TestState", "TestResult", "TeamSide",
 ]