fix: Dynamic API detection and robust Nginx proxy rules

frontend/lib/api.ts

@@ -1,6 +1,15 @@
 import type { AnalysisHistoryItem, AnalysisResult, CompanyProfile, Tender } from "./types";
 
-const API_BASE = process.env.NEXT_PUBLIC_API_BASE ?? "http://localhost:8000";
+const getApiBase = () => {
+  if (process.env.NEXT_PUBLIC_API_BASE) return process.env.NEXT_PUBLIC_API_BASE;
+  if (typeof window !== "undefined") {
+    // If we are in a Hugging Face Space, we need to ensure we point to the right origin
+    return window.location.origin;
+  }
+  return "http://localhost:8000";
+};
+
+const API_BASE = getApiBase();
 
 const jsonHeaders = {
   "Content-Type": "application/json",

nginx.conf

@@ -12,15 +12,13 @@ server {
     }
 
     location /api {
-        proxy_pass http://localhost:8000/api;
+        proxy_pass http://127.0.0.1:8000;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
-        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header X-Forwarded-Proto $scheme;
     }
 
     location /health {
-        proxy_pass http://localhost:8000/health;
+        proxy_pass http://127.0.0.1:8000/api/health;
         proxy_set_header Host $host;
     }
 }