fix: correct nginx env directive placement

- Move env directive from http block to main context
- Fix nginx configuration error preventing container startup
- Environment variables now properly accessible to nginx

Author: codebude

nginx.conf

@@ -1,3 +1,6 @@
+# Enable environment variable access
+env SEARCH_HIGHLIGHT_LIMIT;
+
 events {
     worker_connections 1024;
 }
@@ -6,9 +9,6 @@ http {
     include /etc/nginx/mime.types;
     default_type application/octet-stream;
 
-    # Enable environment variable access
-    env SEARCH_HIGHLIGHT_LIMIT;
-
     server {
         listen 80;
         server_name localhost;