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Simple chat example

Signed-off-by: Matt Williams <m@technovangelist.com>

Co-authored-by: Bruce MacDonald <brucewmacdonald@gmail.com>

Co-authored-by: Bruce MacDonald <brucewmacdonald@gmail.com>

Co-authored-by: Bruce MacDonald <brucewmacdonald@gmail.com>

Signed-off-by: Matt Williams <m@technovangelist.com>

Signed-off-by: Xe Iaso <xe@camellia.finch-kitefin.ts.net>

do not fail on unsupported template variables

add version api and show server version in cli

Thank you @calderonsamuel 

update for qwen

load projectors

split from into one or more models

refactor layer creation

fix: trim space in modelfile fields

This reverts commit 7a0899d6.

Signed-off-by: Matt Williams <m@technovangelist.com>

previous layer creation was not ideal because:

1. it required reading the input file multiple times, once to calculate
   the sha256 checksum, another to write it to disk, and potentially one
   more to decode the underlying gguf
2. used io.ReadSeeker which is prone to user error. if the file isn't
   reset correctly or in the right place, it could end up reading an
   empty file

there are also some brittleness when reading existing layers else
writing the inherited layers will error reading an already closed file

this commit aims to fix these issues by restructuring layer creation.

1. it will now write the layer to a temporary file as well as the hash
   function and move it to the final location on Commit
2. layers are read once once when copied to the destination. exception
   is raw model files which still requires a second read to decode the
   model metadata