feat(config) : set upload limits to 50MB and add uploads volume

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/nginx/conf.d/lesstime.conf

@@ -5,6 +5,8 @@ server {
     root /var/www/html/frontend/dist;
     index index.html;
 
+    client_max_body_size 55m;
+
     location ^~ /api/ {
         root /var/www/html/public;
         try_files $uri /index.php?$query_string;