refactor(backend): move general things into utils.py

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[codecov]

Codecov Report

Attention: Patch coverage is 89.18919% with 4 lines in your changes missing coverage. Please review.

Project coverage is 49.29%. Comparing base (3f9a18b) to head (b17b568).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/aigis/utils.py	87.87%	4 Missing ⚠️

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   48.32%   49.29%   +0.97%     
==========================================
  Files          17       18       +1     
  Lines         209      213       +4     
  Branches       28       28              
==========================================
+ Hits          101      105       +4     
  Misses        100      100              
  Partials        8        8              

Flag	Coverage Δ
backend	93.44% <89.18%> (+0.46%)	⬆️
frontend	31.57% <ø> (ø)

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Files with missing lines	Coverage Δ
src/aigis/__init__.py	100.00% <100.00%> (+10.00%)	⬆️
src/aigis/test_something.py	100.00% <100.00%> (ø)
src/aigis/utils.py	87.87% <87.87%> (ø)

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