feat(phase-19): add remediation fields and reports system (T-130, T-131)

backend/app/models/test.py

@@ -49,9 +49,15 @@ class Test(Base):
     blue_validation_status = Column(String, nullable=True)  # pending / approved / rejected
     blue_validation_notes = Column(Text, nullable=True)
 
+    # ── Remediation fields ───────────────────────────────────────────
+    remediation_steps = Column(Text, nullable=True)
+    remediation_status = Column(String, nullable=True)  # pending / in_progress / completed / not_applicable
+    remediation_assignee = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+
     # ── Relationships ───────────────────────────────────────────────
     technique = relationship("Technique", back_populates="tests")
     evidences = relationship("Evidence", back_populates="test")
     creator = relationship("User", foreign_keys=[created_by])
     red_validator = relationship("User", foreign_keys=[red_validated_by])
     blue_validator = relationship("User", foreign_keys=[blue_validated_by])
+    remediation_user = relationship("User", foreign_keys=[remediation_assignee])

backend/app/models/test_template.py

@@ -34,6 +34,7 @@ class TestTemplate(Base):
     tool_suggested = Column(String, nullable=True)
     severity = Column(String, nullable=True)                     # low / medium / high / critical
     atomic_test_id = Column(String, nullable=True)               # ID in Atomic Red Team repo
+    suggested_remediation = Column(Text, nullable=True)
     is_active = Column(Boolean, default=True)
     created_at = Column(DateTime, default=datetime.utcnow)