feat: implement Presentation layer for GET /api/v1/users/{id} / Presentation層のuserById実装

[zigzagdev]

Motivation / 目的

Implement the Controller and route for the User findById API as part of #507.

#507 の一環として、ユーザー取得APIのControllerとRouteを実装しました。

What I have done / 実施内容

• UserController::getUserById(): call GetUserByIdUseCase and return UserDto as JSON
  • 200 on success
  • 404 when 'User not found.' exception is thrown
  • 500 on other errors with Log::error
• Route: GET /api/v1/users/{id}

Test Results / テスト結果

Integration tests hitting the real DB and HTTP endpoint:

• test_get_user_by_id_returns_200_with_user_data
• test_get_user_by_id_returns_404_when_user_not_found

Closes #509

[zigzagdev]

Ok

[codecov]

Codecov Report

❌ Patch coverage is 88.57143% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.06%. Comparing base (bc8de06) to head (658cadb).

Files with missing lines	Patch %	Lines
...pp/Packages/Features/Controller/UserController.php	60.00%	8 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                     @@
##             feat/user_find_by_id     #512      +/-   ##
==========================================================
+ Coverage                   58.78%   59.06%   +0.27%     
- Complexity                   1478     1488      +10     
==========================================================
  Files                         114      115       +1     
  Lines                        7505     7575      +70     
==========================================================
+ Hits                         4412     4474      +62     
- Misses                       3093     3101       +8     

Files with missing lines	Coverage Δ
...rc/app/Packages/Features/Tests/GetUserByIdTest.php	100.00% <100.00%> (ø)
...pp/Packages/Features/Controller/UserController.php	77.77% <60.00%> (-22.23%)	⬇️

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