Adds LongCat, SenseNova, AMD Token Factory, Volcengine Ark, Baidu Qianfan,
iFlytek Spark, AIHubMix, OVHcloud AI Endpoints, LLM7.io, Token Harbor,
Aion Labs, Experiential Labs, and Empero to the free providers section,
each with limits, endpoint, source, and check date.
Removes .claude/settings.json; permissions now live in the ignored
settings.local.json.
