feat: add optional authorization header for Ollama to support Open WebUI

[MorpheusI0]

Features

• added optional authorization header for Ollama

Feature Docs

Open WebUI lets users create personal API-keys and forwards authenticated requests to Ollama. Unfortunately no content type was declared on the response.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 62.59%. Comparing base (ab846f6) to head (fa7e3ae).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1465   +/-   ##
=======================================
  Coverage   62.59%   62.59%           
=======================================
  Files         287      287           
  Lines       17589    17591    +2     
=======================================
+ Hits        11009    11011    +2     
  Misses       6580     6580           

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[better629]

lgtm