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* Fixed the API endpoint /api/tags to return {models: []} instead of {models: null} when the model list is empty.

* Update server/routes.go

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Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

This should resolve a number of memory leak and stability defects by allowing
us to isolate llama.cpp in a separate process and shutdown when idle, and
gracefully restart if it has problems.  This also serves as a first step to be
able to run multiple copies to support multiple models concurrently.

Co-authored-by: Michael Yang <mxyng@pm.me>