feat: implement Presentation layer for DELETE /api/v1/favorites/{world_heritage_id} / お気に入り解除のPresentation層実装

[zigzagdev]

Motivation / 目的

Expose RemoveFavoriteUseCase through a REST endpoint so the frontend can remove a favorite, both from the favorites list screen and, later, from the toggle heart button on the top/search/detail pages.

RemoveFavoriteUseCase をREST APIとして公開します。お気に入り一覧画面の削除、および将来のトグルハートボタンの両方から使われます。

What I have done / 実施内容

• Added DELETE /api/v1/favorites/{world_heritage_id} route
• Added FavoriteController::removeFavorite, returning 200 { "status": "success" } on success (matching addFavorite's response shape), 404 when the user is not found, 401 when unauthenticated

Test Results / テスト結果

• test_removeFavorite_returns_200_and_removes_favorite_when_authenticated
• test_removeFavorite_returns_200_when_not_favorited
• test_removeFavorite_returns_401_when_unauthenticated
• test_removeFavorite_returns_500_on_unexpected_error

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.66%. Comparing base (7f1caa6) to head (4527c4e).
⚠️ Report is 2 commits behind head on feat/user-favorite.

Files with missing lines	Patch %	Lines
...ackages/Features/Controller/FavoriteController.php	80.95%	4 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##             feat/user-favorite     #576      +/-   ##
========================================================
+ Coverage                 64.46%   64.66%   +0.19%     
- Complexity                 1687     1694       +7     
========================================================
  Files                       147      147              
  Lines                      8798     8858      +60     
========================================================
+ Hits                       5672     5728      +56     
- Misses                     3126     3130       +4     

Files with missing lines	Coverage Δ
...Packages/Features/Tests/FavoriteControllerTest.php	99.31% <100.00%> (+0.24%)	⬆️
...ackages/Features/Controller/FavoriteController.php	85.96% <80.95%> (-2.93%)	⬇️

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[zigzagdev]

Ok