fix(routing): enforce slashless public URLs

www/reports/nginx-rewrites.conf

@@ -1,3 +1,17 @@
+## Include these directives inside the public HTTPS server block, before the
+## generic static `location /` handler. Root (`/`) is the only trailing-slash
+## public URL; every other terminal slash receives a query-preserving 308.
+location ~ ^(.+?)/+$ {
+  return 308 $1$is_args$args;
+}
+
+## The static handler must serve the generated directory artifact at its
+## slashless public path. Do not use `$uri/`, which permits nginx's automatic
+## directory-slash redirect before `$uri/index.html` can be served.
+location / {
+  try_files $uri $uri/index.html $uri.html =404;
+}
+
 rewrite ^/aba$ /aba-therapy permanent;
 rewrite ^/autismevaluations$ /autism-evaluations permanent;
 rewrite ^/learnersocialclub$ /learner-social-club permanent;