set up basic frontend and separate frontend and backend

[iulusoy]

• separate backend logic from frontend
• set up initial, simple frontend

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.99%. Comparing base (57ce4dd) to head (fff518c).

Files with missing lines	Patch %	Lines
src/app/main.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   89.84%   80.99%   -8.86%     
==========================================
  Files           9        9              
  Lines         128      121       -7     
==========================================
- Hits          115       98      -17     
- Misses         13       23      +10     

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