🔥 visibility追加、v1API削除

[ikura-hamu]

• ゲームの公開範囲の概念を追加
• それに伴い、変更箇所が大きくなりすぎていたので、v1のAPIを削除

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (68ba8ba) 61.17% compared to head (10680b5) 51.74%.
Report is 32 commits behind head on develop.

Files	Patch %	Lines
src/handler/v2/checker.go	0.00%	7 Missing ⚠️
src/handler/v2/game.go	45.45%	6 Missing ⚠️
src/domain/game.go	0.00%	5 Missing ⚠️
src/repository/gorm2/db.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #777      +/-   ##
===========================================
- Coverage    61.17%   51.74%   -9.44%     
===========================================
  Files          125       91      -34     
  Lines        11656     8028    -3628     
===========================================
- Hits          7131     4154    -2977     
+ Misses        4142     3616     -526     
+ Partials       383      258     -125     

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