fix(clsi-nginx): add video and audio mime types

.mp4/.webm/etc. were served as application/octet-stream because the
custom types block overrides nginx defaults and was missing media types.
Browsers refuse to play media with a non-media Content-Type, especially
with X-Content-Type-Options: nosniff set.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server-ce/nginx/clsi-nginx.conf

@@ -42,6 +42,12 @@ server {
       font/woff2                 woff2;
       application/pdf            pdf;
       text/plain                 log blg aux stdout stderr txt;
+      video/mp4                  mp4;
+      video/webm                 webm;
+      video/ogg                  ogv ogg;
+      audio/mpeg                 mp3;
+      audio/ogg                  oga;
+      audio/wav                  wav;
   }
   # handle output files for specific users
   location ~ ^/project/([0-9a-f]+)/user/([0-9a-f]+)/build/([0-9a-f-]+)/output/(.+)$ {