optimize shap response latency

frontend/src/views/JDRAnalysis.vue

@@ -385,6 +385,7 @@ function renderRiskChart() {
 
 // ── Tab 4: SHAP ──
 async function loadShapGlobal() {
+  if (activeTab.value !== 'shap') return
   try {
     const data = await getGlobalImportance(shapModel.value)
     if (data.error) { ElMessage.error(data.error); return }
@@ -460,6 +461,7 @@ function renderShapDimPie() {
 }
 
 async function loadDependence() {
+  if (activeTab.value !== 'shap') return
   if (!dependenceFeature.value) return
   try {
     const data = await getDependence(dependenceFeature.value, shapModel.value)
@@ -483,6 +485,7 @@ async function loadDependence() {
 }
 
 async function loadInteractions() {
+  if (activeTab.value !== 'shap') return
   try {
     const data = await getInteractions(shapModel.value, 10)
     if (data.error || !data.top_interactions) return