feat: implement Application layer for removing favorites / お気に入り解除のApplication層実装

[zigzagdev]

Motivation / 目的

Add the Application-layer use case that removes a favorite, sitting on top of FavoriteRepository::removeFavorite from #572.

#572 で追加した FavoriteRepository::removeFavorite を呼び出すApplication層のUseCaseです。

What I have done / 実施内容

• Added RemoveFavoriteUseCase::handle(int $userId, int $worldHeritageSiteId): void

Test Results / テスト結果

• test_handle_calls_repository_removeFavorite_with_given_ids
• test_handle_propagates_exception_when_user_not_found

Depends on #572

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.46%. Comparing base (63bdf49) to head (7f1caa6).
⚠️ Report is 1 commits behind head on feat/user-favorite.

Additional details and impacted files

@@                   Coverage Diff                    @@
##             feat/user-favorite     #575      +/-   ##
========================================================
+ Coverage                 64.38%   64.46%   +0.08%     
- Complexity                 1682     1687       +5     
========================================================
  Files                       145      147       +2     
  Lines                      8776     8798      +22     
========================================================
+ Hits                       5650     5672      +22     
  Misses                     3126     3126              

Files with missing lines	Coverage Δ
...seCases/UseCase/Favorite/RemoveFavoriteUseCase.php	100.00% <100.00%> (ø)
...ests/CommandUseCases/RemoveFavoriteUseCaseTest.php	100.00% <100.00%> (ø)

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[zigzagdev]

Ok