fix: avoid worker fetch noise when server is offline

app/web/static/js/data-sync.worker.js

@@ -49,7 +49,9 @@ async function fetchModels() {
 
     try {
         const response = await fetch(buildApiUrl(`${API_BASE}/models`));
-        if (!response.ok) throw new Error("Failed to load models");
+        if (!response.ok) {
+            return null;
+        }
         
         const data = await response.json();
         const models = data.models || [];
@@ -108,7 +110,7 @@ async function fetchRunningModels() {
     try {
         const response = await fetch(buildApiUrl(`${API_BASE}/models/running`));
         if (!response.ok) {
-            throw new Error("Failed to load running models");
+            return null;
         }
 
         const data = await response.json();
@@ -137,8 +139,9 @@ async function syncData() {
     }
 
     const health = await fetchHealth();
-    const modelsData = await fetchModels();
-    const runningData = await fetchRunningModels();
+    const isOnline = health?.ollama_status === "online";
+    const modelsData = isOnline ? await fetchModels() : null;
+    const runningData = isOnline ? await fetchRunningModels() : null;
 
     if (modelsData && modelsData.models.length > 0) {
         modelsData.showByModel = await fetchAllModelsShow(modelsData.models);