Fix: Add API proxy through Next.js rewrites for Hugging Face deployment

Dockerfile

@@ -13,7 +13,7 @@ RUN npm install
 
 # Force cache invalidation for source file changes
 # Increment this value to force Docker to rebuild from this point
-ARG CACHEBUST=6
+ARG CACHEBUST=7
 
 # Copy all necessary files for Next.js build
 # Source files copied BEFORE config to invalidate cache when they change

lib/api.ts

@@ -5,7 +5,9 @@
 
 import { DocumentResults, ProcessResponse } from '@/types';
 
-const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8000';
+// Use empty string to make requests relative to current origin
+// Next.js will proxy /api/* requests to the backend via rewrites
+const API_BASE = process.env.NEXT_PUBLIC_API_URL || '';
 
 export interface UploadResponse {
   document_id: string;

next.config.ts

@@ -2,6 +2,14 @@ import type { NextConfig } from 'next';
 
 const nextConfig: NextConfig = {
   reactStrictMode: true,
+  async rewrites() {
+    return [
+      {
+        source: '/api/:path*',
+        destination: 'http://localhost:8000/api/:path*',
+      },
+    ];
+  },
 };
 
 export default nextConfig;