Support for provider prefixes

[haesleinhuepf]

to ensure the right models are asked, e.g. if you access DeepSeek via github_models, you can call "github_models:DeepSeek-R1".

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.04%. Comparing base (93984d8) to head (314ba53).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #591   +/-   ##
=======================================
  Coverage   59.04%   59.04%           
=======================================
  Files          14       14           
  Lines        1829     1829           
=======================================
  Hits         1080     1080           
  Misses        749      749           

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