fix: ensure Nginx config is enabled and simplify API base detection

Dockerfile

@@ -40,6 +40,7 @@ COPY --from=frontend-builder /app/frontend/node_modules ./frontend/node_modules
 
 # Nginx Config
 COPY nginx.conf /etc/nginx/sites-available/default
+RUN ln -sf /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default
 
 # Start Script
 COPY start.sh .

frontend/lib/api.ts

@@ -4,43 +4,21 @@ import type { AnalysisHistoryItem, AnalysisResult, CompanyProfile, Tender, Purch
 export function getAPIBase(): string {
   // 1. Explicit env var (highest priority)
   if (process.env.NEXT_PUBLIC_API_BASE) {
-    console.log('[API] Using explicit NEXT_PUBLIC_API_BASE:', process.env.NEXT_PUBLIC_API_BASE);
     return process.env.NEXT_PUBLIC_API_BASE;
   }
 
-  // Only works on client side
-  if (typeof window === 'undefined') {
-    return '';
-  }
+  if (typeof window === 'undefined') return '';
 
   const hostname = window.location.hostname;
-  const protocol = window.location.protocol;
-
-  // 2. Hugging Face Space detection (IMPROVED)
-  if (hostname.includes('.hf.space')) {
-    // On HF Spaces, we use relative paths because we run Nginx as a proxy
-    // to both the frontend and backend in the same container.
-    console.log('[API] Hugging Face Space detected. Using relative paths.');
-    return '';
-  }
-
-  // 3. Vercel/Production detection
-  if (hostname.includes('vercel.app')) {
-    const backendUrl = process.env.REACT_APP_API_BASE || `${protocol}//${hostname.replace('andesai', 'andesai-api')}`;
-    console.log('[API] Vercel environment detected. Using:', backendUrl);
-    return backendUrl;
-  }
-
-  // 4. GitHub Pages + external API
-  if (hostname.includes('github.io') || hostname.includes('github.dev')) {
-    const backendUrl = process.env.REACT_APP_API_BASE || 'https://andesai-backend.fly.dev';
-    console.log('[API] GitHub Pages detected. Using:', backendUrl);
-    return backendUrl;
+  
+  // 2. Local development detection
+  if (hostname === 'localhost' || hostname === '127.0.0.1') {
+    return 'http://localhost:8000';
   }
 
-  // 5. Local development fallback
-  console.log('[API] Local development environment detected');
-  return 'http://localhost:8000';
+  // 3. For HF Spaces and production, we use relative paths handled by Nginx proxy
+  // This is the most robust way to handle both internal and external traffic
+  return '';
 }
 
 const API_BASE = getAPIBase();