Gov. Dannel P. Malloy said Thursday a day of reckoning has arrived for Connecticut’s depleted special transportation fund and the services and projects it finances, outlining what is likely to be an election-year challenge for the General Assembly next year and, perhaps, the last major initiative of a lame-duck governor. With a long hit list of projects and services destined to be shelved without an infusion of revenue, Malloy is attempting to bring a sense of urgency to a legislature that has proven to be remarkably indifferent to a crumbling and underfunded transportation infrastructure over the tenures of a half-dozen governors.