Spott ATS Integration

Add integration with Spott, an AI native ATS platform, so Arrange can sync directly with Spott accounts for scheduling. Spott's team has confirmed there's no overlap with their current partner ecosystem, making Arrange a clear fit. Their ICP is recruiting agencies and they are growing fast. Will want to knock this out as soon as we can but wanted to do ezekia first as well. Once built, we'll do a joint announcement with Spott (newsletter and/or webinar) and get cross-listed on each other's integration pages to drive visibility to both user bases.