Fix conversation ID extraction from API response

- Change from conversationData.conversation_id to conversationData.id
- Add validation to ensure conversation ID exists before proceeding
- This fixes the 'undefined' conversation ID issue in message posting

Co-authored-by: openhands <openhands@all-hands.dev>

Author: openhands-agent

example/src/utils/serverStatus.ts

@@ -109,7 +109,14 @@ export const testLLMConfiguration = async (settings: Settings): Promise<{ succes
     }
 
     const conversationData = await createResponse.json();
-    const conversationId = conversationData.conversation_id;
+    const conversationId = conversationData.id;
+
+    if (!conversationId) {
+      return { 
+        success: false, 
+        error: `Failed to get conversation ID from response: ${JSON.stringify(conversationData)}` 
+      };
+    }
 
     try {
       // Send a simple test message