Fix issue with localhost refs

frontend/Dockerfile

@@ -12,8 +12,8 @@ COPY . .
 # Expose port
 EXPOSE 3050
 
-# Set environment variable for API URL
-ENV VITE_API_URL=http://localhost:3051/api
+# Set environment variable for API URL (relative to the frontend host)
+ENV VITE_API_URL=/api
 
 # Start development server
 CMD ["npm", "start"]

frontend/src/services/api.js

@@ -4,10 +4,7 @@ const API_BASE_URL = import.meta.env.VITE_API_URL || '/api';
 
 const api = axios.create({
   baseURL: API_BASE_URL,
-  timeout: 30000,
-  headers: {
-    'Content-Type': 'application/json'
-  }
+  timeout: 30000
 });
 
 export const getLineOfSight = async (lat, lon, direction, tolerance) => {