Update src/main/resources/static/index.html

That line is the one breaking in Spaces (hardcoded http://localhost:8080). Use a relative/same-origin URL so calls like ${API_BASE_URL}/health and ${API_BASE_URL}/message hit your container on port 7860. You can see the current line in your file here (search for API_BASE_URL).

src/main/resources/static/index.html

@@ -332,7 +332,7 @@
 
 <script>
     // Configuration
-    const API_BASE_URL = 'http://localhost:8080/api/chat';
+    const API_BASE_URL = '/api/chat';
 
     // DOM Elements
     const chatMessages = document.getElementById('chatMessages');