Fix Lightning payment UI not updating after LNbits invoice is paid.

Ensure the booking page receives payment confirmation via a streaming SSE proxy, parallel status polling, and more reliable backend event delivery.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/front-end_nginx.conf

@@ -43,6 +43,25 @@ server {
     access_log /var/log/nginx/spanglish_frontend_access.log;
     error_log  /var/log/nginx/spanglish_frontend_error.log;
 
+    # LNbits payment SSE stream - must not be buffered or events won't flush in
+    # real time. Regex location takes precedence over the /api prefix below.
+    location ~ ^/api/lnbits/stream/ {
+        proxy_pass http://spanglish_backend;
+        proxy_http_version 1.1;
+
+        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;
+        proxy_set_header Connection '';
+
+        # Disable buffering/caching for Server-Sent Events
+        proxy_buffering off;
+        proxy_cache off;
+        proxy_read_timeout 3600s;
+        proxy_connect_timeout 300s;
+    }
+
     # Proxy /api to backend
     location /api {
         proxy_pass http://spanglish_backend;