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/api/handlers/iace_handler_init.go

@@ -42,8 +42,29 @@ func (h *IACEHandler) InitializeProject(c *gin.Context) {
 		return
 	}
 
+	// Support ?force=true to clear existing hazards + mitigations before re-init
+	forceReinit := c.Query("force") == "true"
+
 	steps := make([]InitStep, 0, 6)
 
+	// ── Step 0 (optional): Clear existing data for force re-init ──
+	if forceReinit {
+		cleared := 0
+		if mits, _ := h.store.ListMitigationsByProject(ctx, projectID); len(mits) > 0 {
+			for _, m := range mits {
+				_ = h.store.DeleteMitigation(ctx, m.ID)
+				cleared++
+			}
+		}
+		if hazards, _ := h.store.ListHazards(ctx, projectID); len(hazards) > 0 {
+			for _, hz := range hazards {
+				_ = h.store.DeleteHazard(ctx, hz.ID)
+				cleared++
+			}
+		}
+		steps = append(steps, InitStep{Name: "Alte Daten geloescht", Status: "done", Count: cleared})
+	}
+
 	// ── Step 1: Extract narrative from limits_form ──
 	narrativeText := extractNarrativeFromMetadata(project.Metadata)
 	if narrativeText == "" {

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
 // ============================================================================