Fix runtime config debug drawer

web/pages/Assistants.tsx

@@ -1193,19 +1193,32 @@ export const DebugDrawer: React.FC<{
   const buildLocalResolvedRuntime = () => {
     const warnings: string[] = [];
     const services: Record<string, any> = {};
+    const isExternalLlm = assistant.configMode === 'dify' || assistant.configMode === 'fastgpt';
 
-    if (assistant.llmModelId) {
-      const llm = llmModels.find((item) => item.id === assistant.llmModelId);
-      if (llm) {
-        services.llm = {
-          provider: 'openai',
-          model: llm.modelName || llm.name,
-          apiKey: llm.apiKey,
-          baseUrl: llm.baseUrl,
-        };
-      } else {
-        warnings.push(`LLM model not found in loaded list: ${assistant.llmModelId}`);
-      }
+    if (isExternalLlm) {
+      services.llm = {
+        provider: 'openai',
+        model: '',
+        apiKey: assistant.apiKey || '',
+        baseUrl: assistant.apiUrl || '',
+      };
+      if (!assistant.apiUrl) warnings.push(`External LLM API URL is empty for mode: ${assistant.configMode}`);
+      if (!assistant.apiKey) warnings.push(`External LLM API key is empty for mode: ${assistant.configMode}`);
+    } else if (assistant.llmModelId) {
+        const llm = llmModels.find((item) => item.id === assistant.llmModelId);
+        if (llm) {
+          services.llm = {
+            provider: 'openai',
+            model: llm.modelName || llm.name,
+            apiKey: llm.apiKey,
+            baseUrl: llm.baseUrl,
+          };
+        } else {
+          warnings.push(`LLM model not found in loaded list: ${assistant.llmModelId}`);
+        }
+    } else {
+      // Keep empty object to indicate engine should use default provider model.
+      services.llm = {};
     }
 
     if (assistant.asrModelId) {
@@ -1245,9 +1258,10 @@ export const DebugDrawer: React.FC<{
     const localResolved = {
       assistantId: assistant.id,
       sources: {
-        llmModelId: assistant.llmModelId || '',
+        llmModelId: isExternalLlm ? '' : (assistant.llmModelId || ''),
         asrModelId: assistant.asrModelId || '',
         voiceId: assistant.voice || '',
+        llmConfigMode: assistant.configMode || 'platform',
       },
       warnings,
       sessionStartMetadata: {