feat: init CLI structure

[Dao-Ho]

Initialize structure for cli commands

[codecov]

Codecov Report

❌ Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.82%. Comparing base (5ae7bfe) to head (2386611).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/cmd/cli/main.go	0.00%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
- Coverage   22.69%   19.82%   -2.87%     
==========================================
  Files          37       40       +3     
  Lines        1300     1493     +193     
==========================================
+ Hits          295      296       +1     
- Misses       1002     1193     +191     
- Partials        3        4       +1     

Flag	Coverage Δ
backend	19.82% <0.00%> (-2.87%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
backend/cmd/cli/main.go	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

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