feat(config): add configuration validation

[reugn]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 97.26027% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.94%. Comparing base (753f75a) to head (db86bd2).

Files with missing lines	Patch %	Lines
internal/config/config.go	90.47%	1 Missing and 1 partial ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   91.52%   91.94%   +0.41%     
==========================================
  Files          18       18              
  Lines         897      968      +71     
==========================================
+ Hits          821      890      +69     
- Misses         44       45       +1     
- Partials       32       33       +1     

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