refactor: add api/backend/proc-macro crate

[vnghia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.53812% with 651 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (8f028ad) to head (1131161).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
nghe-backend/src/transcode/transcoder.rs	72.66%	3 Missing and 38 partials ⚠️
nghe-backend/src/file/audio/artist.rs	87.62%	16 Missing and 21 partials ⚠️
nghe-backend/src/scan/scanner.rs	74.78%	25 Missing and 4 partials ⚠️
nghe-backend/src/lib.rs	0.00%	23 Missing ⚠️
nghe-backend/src/file/picture/mod.rs	86.50%	11 Missing and 11 partials ⚠️
nghe-backend/src/filesystem/path/serde.rs	0.00%	21 Missing ⚠️
nghe-backend/src/test/mock_impl/music_folder.rs	90.54%	15 Missing and 6 partials ⚠️
nghe-proc-macro/src/backend.rs	91.46%	7 Missing and 11 partials ⚠️
nghe-backend/src/orm/id3/song/mod.rs	65.30%	8 Missing and 9 partials ⚠️
nghe-backend/src/file/audio/information.rs	80.24%	1 Missing and 15 partials ⚠️
... and 131 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
- Coverage   81.82%   81.80%   -0.03%     
==========================================
  Files         213      386     +173     
  Lines       12185    17166    +4981     
  Branches    12185    17166    +4981     
==========================================
+ Hits         9970    14042    +4072     
- Misses       1721     2311     +590     
- Partials      494      813     +319     

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