Fixed several bugs introduced by the pipeline refactoring.
Updated goexif2 fork to use my latest commit which fixes not being able to find EXIF data on some JPEG images.
Embeddings now refer to the item they are for, rather than an item referring to a single embedding. This allows items to have multiple embeddings if necessary, which gives us some flexibility when models change/improve, etc.
Also reworked the Python server to use a smaller model (base siglip2 instead of so400m) so that it will fit on more GPUs, including my 4070; as well as a new "DeviceManager" that ChatGPT helped me figure out, to choose GPU when it has enough memory for it, as conditions change.
