Fix API baseURL for relative paths in production

client/lib/api.ts

@@ -1,8 +1,14 @@
 import axios from 'axios';
 
 // Configure axios to connect to FastAPI backend
+// If NEXT_PUBLIC_API_URL is provided, use it. Otherwise, use relative paths (empty string)
+// which works perfectly when serving frontend and backend from the same Docker container.
+const apiBaseUrl = process.env.NEXT_PUBLIC_API_URL !== undefined 
+  ? process.env.NEXT_PUBLIC_API_URL 
+  : 'http://127.0.0.1:8000';
+
 const apiClient = axios.create({
-  baseURL: process.env.NEXT_PUBLIC_API_URL || 'http://127.0.0.1:8000',
+  baseURL: apiBaseUrl,
   timeout: 180000, // 3 minute timeout for analysis
 });