feat: implement Presentation layer for User Update API / ユーザー更新APIのPresentation層実装

[zigzagdev]

Overview / 概要

Implement the Controller and route for the User Update API, as part of #500.

#500 の一環として、ユーザー更新APIのControllerとRouteを実装する。

Requirements / 要件

• Controller: UserController::updateUser() with try/catch (same pattern as createUser)
  • 200 on success, 500 on error with server-side Log
  • Use Request for the incoming request (no validation at this layer)
• ViewModel: Reuse existing UserViewModel and UserViewModelFactory
• Route: PATCH /api/v1/user/{id} (or PUT — to be decided)

Tasks / タスク

• Add updateUser action to UserController
• Register route in api.php
• Write unit tests for Controller layer to meet Codecov patch coverage target

Parent issue / 親Issue

#500