feat(iace): "Neu initialisieren" Button + DeleteHazard

- POST /initialize?force=true loescht bestehende Hazards + Mitigations
  und erstellt sie neu mit aktuellen Betriebszustaenden
- Orange "Neu initialisieren" Button auf Interview-Seite (mit Confirm-Dialog)
- DeleteHazard Store-Methode (kaskadiert Risk Assessments)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/store_hazards.go

@@ -199,6 +199,19 @@ func (s *Store) UpdateHazard(ctx context.Context, id uuid.UUID, updates map[stri
 	return s.GetHazard(ctx, id)
 }
 
+// DeleteHazard removes a hazard and its risk assessments.
+func (s *Store) DeleteHazard(ctx context.Context, id uuid.UUID) error {
+	_, err := s.pool.Exec(ctx, `DELETE FROM iace_risk_assessments WHERE hazard_id = $1`, id)
+	if err != nil {
+		return fmt.Errorf("delete hazard assessments: %w", err)
+	}
+	_, err = s.pool.Exec(ctx, `DELETE FROM iace_hazards WHERE id = $1`, id)
+	if err != nil {
+		return fmt.Errorf("delete hazard: %w", err)
+	}
+	return nil
+}
+
 // ============================================================================
 // Risk Assessment Operations
 // ============================================================================