Address review feedback on ULONG_MAX availability in http_server

[Copilot]

Clarified that ULONG_MAX is already available through the existing include chain and does not require an explicit #include <limits.h> in fd_http_server.c.

Context

The overflow check introduced in the parent PR (#8391) uses ULONG_MAX:

ulong digit = (ulong)(content_length[ i ]-'0');
if( FD_UNLIKELY( content_len>(ULONG_MAX-digit)/10UL ) ) { /* Overflow */
  close_conn( http, conn_idx, FD_HTTP_SERVER_CONNECTION_CLOSE_LARGE_REQUEST );
  return;
}

Resolution

No code changes required. ULONG_MAX is provided via the include chain:

• fd_http_server.c includes fd_http_server_private.h
• fd_http_server_private.h includes fd_http_server.h
• fd_http_server.h includes fd_util_base.h
• fd_util_base.h includes <limits.h>

Compilation verified successful.

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