fix(deploy): close container final review

docker/nginx.conf.template

@@ -8,6 +8,13 @@ server {
         try_files $uri =404;
     }
 
+    location = /health {
+        proxy_pass http://core:8787/health;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_cache off;
+    }
+
     location /api/ {
         proxy_pass http://core:8787/;
         proxy_http_version 1.1;
@@ -15,6 +22,9 @@ server {
         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;
+        # Trusted only when AUTH_MODE=upstream and this frontend port is reachable solely
+        # from the authenticated host proxy documented in deploy/.
+        proxy_set_header X-Authenticated-User $http_x_authenticated_user;
         proxy_buffering off;
         proxy_cache off;
         proxy_read_timeout 1h;