refactor: nginx config

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

apps/web/nginx.conf

@@ -10,6 +10,16 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
+    # pdfjs-dist ships its worker as an ES module. Firefox rejects a module
+    # worker when nginx falls back to application/octet-stream for .mjs.
+    location ~* \.mjs$ {
+        types {
+            application/javascript mjs;
+        }
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
     # Cache hashed assets aggressively
     location ~* \.(js|css|woff2?|ttf|svg|ico|png|jpg|jpeg|webp|gif)$ {
         expires 1y;