Mixi2をAccountTypeに追加

[Tennessine699]

resolves #748

#745 feat/add_account_bluesky のブランチからはやしてます

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.98%. Comparing base (6afe821) to head (2b990ff).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/domain/user.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #749      +/-   ##
==========================================
+ Coverage   70.66%   70.98%   +0.32%     
==========================================
  Files          43       43              
  Lines        4578     4584       +6     
==========================================
+ Hits         3235     3254      +19     
+ Misses       1188     1174      -14     
- Partials      155      156       +1     

Flag	Coverage Δ
integration	70.98% <83.33%> (+0.32%)	⬆️
unit	70.98% <83.33%> (+0.32%)	⬆️

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[Pugma]

よさそうです！
正規表現の修正対応もありがとうございました！

CI 通り次第 merge お願いします 🙏