Add logout endpoint to Nginx configuration to prevent a new token on logout (#23678)

* Add logout endpoint to Nginx configuration to prevent logout from silently generating a new frigate_token cookie

* Change JWT cookie expiration to use max_age and have the appropriate expiration time based on JWT_SESSION_LENGTH

* ruff formatting

docker/main/rootfs/usr/local/nginx/conf/nginx.conf

@@ -274,6 +274,13 @@ http {
                 include proxy.conf;
             }
 
+            location /api/logout {
+                auth_request off;
+                rewrite ^/api(/.*)$ $1 break;
+                proxy_pass http://frigate_api;
+                include proxy.conf;
+            }
+
             # Allow unauthenticated access to the first_time_login endpoint
             # so the login page can load help text before authentication.
             location /api/auth/first_time_login {