Fix validation field name in namespace analysis

- Change validation.validation_type to validation.rule_name
- API returns rule_name field, not validation_type
- Fix undefined display in namespace analysis modal
- Ensure proper validation type display in detailed view

app/static/index.html

@@ -1264,7 +1264,7 @@
                         const severityClass = `severity-${validation.severity}`;
                         content += `
                             <div class="validation-item ${severityClass}">
-                                <p><strong>${validation.validation_type}:</strong> ${validation.message}</p>
+                                <p><strong>${validation.rule_name}:</strong> ${validation.message}</p>
                                 <p><em>Recommendation:</em> ${validation.recommendation}</p>
                             </div>
                         `;