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* cmd: support OLLAMA_HOST environment variable

This commit adds support for the OLLAMA_HOST environment
variable. This variable can be used to specify the host to which
the client should connect. This is useful when the client is
running somewhere other than the host where the server is running.

The new api.FromEnv function is used to read configure clients from the
environment. Clients wishing to use the environment variable being
consistent with the Ollama CLI can use this new function.

* Update api/client.go
Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

* Update api/client.go
Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

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

Co-Authored-By: Jeffrey Morgan <jmorganca@gmail.com>

- default to embeddings enabled
- move embedding logic for loaded model to request
- allow embedding full directory
- close llm on reload

Fixes #297
Fixes #296

num_keep defines how many tokens to keep in the context when truncating
inputs. if left to its default value of -1, the server will calculate
num_keep to be the left of the system instructions

- read runner options from map to see what was specified explicitly and overwrite zero values