Add a tool registry which keeps tracks of tools and from which endpoints they originated from. We need to know the endpoint so that we a tool call is made it is made against the correct endpoint.

Test plan

go run ./cmd/src deepsearch -question 'which repo uses bazel?'

registry tracks tools and from which endpoints they originated from

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Should we just update the server now to include deep search tools on v1? That way we can avoid making this more complicated. Otherwise we can move forward with this.

A part of me think we should. I'd still keep this registry though but remove the endpoint tracking.

Site note: should it be deep-search instead of deepsearch?