nginx: aumenta client_max_body_size para 500m em git.tadix.dev

Permite upload de assets de release grandes no Forgejo.

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

hosts/NixOracle/configuration.nix

@@ -152,6 +152,7 @@ in {
           proxy_set_header Host $host;
           proxy_set_header X-Real-IP $remote_addr;
           proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+          client_max_body_size 500m;
         '';
       };
     };