refactor: auth and file services structure

[j3rrryy]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (29cbef1) to head (c8b056b).
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Additional details and impacted files

@@            Coverage Diff             @@
##              main        #4    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          122       144    +22     
  Lines         2583      2726   +143     
  Branches        81        75     -6     
==========================================
+ Hits          2583      2726   +143     

Flag	Coverage Δ
auth	100.00% <100.00%> (ø)
file	100.00% <100.00%> (ø)
gateway	100.00% <100.00%> (ø)
mail	100.00% <100.00%> (ø)

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