fix: default subscription_tier to free in SubscriptionFactory when omitted / SubscriptionFactoryでsubscription_tier省略時にfreeへデフォルト設定

[zigzagdev]

Motivation / 目的

subscription_tier was already made optional at the CreateUserCommand/CreateUserUseCase level, but the Domain-layer factories (UserEntityFactory, SubscriptionFactory) still assumed the key was always present and non-null. Any future caller that omitted subscription_tier would hit a TypeError from SubscriptionTier::from(null) instead of getting the intended free default.

subscription_tierはCreateUserCommand/CreateUserUseCase側では既に任意項目化されていましたが、Domain層のファクトリ(UserEntityFactory, SubscriptionFactory)は依然として値が必ず存在する前提でした。将来subscription_tierを省略する呼び出しが増えた場合、SubscriptionTier::from(null)でTypeErrorになってしまう抜けがありました。

What I have done / 実施内容

• SubscriptionFactory::build(): default the tier to SubscriptionTier::Free->value when $data['tier'] is null
• UserEntityFactory::build(): pass $data['subscription_tier'] ?? null instead of a direct array access, so a missing key no longer raises an undefined array key warning before reaching SubscriptionFactory
• Added test coverage for the default behavior

Test Results / テスト結果

• UserEntityFactoryTest::test_build_returns_user_entity_with_correct_values
• UserEntityFactoryTest::test_build_sets_password_hash_when_provided
• UserEntityFactoryTest::test_build_defaults_subscription_tier_to_free_when_omitted
• UserEntityFactoryTest::test_build_passes_expires_at_to_subscription
• SubscriptionTest (all cases)
• UserEntityTest (all cases)
• CreateUserCommandTest / CreateUserUseCaseTest / UpdateUserCommandTest / UpdateUserUseCaseTest (all cases)

Closes #559

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.90%. Comparing base (93a87c4) to head (a764093).
⚠️ Report is 1 commits behind head on feat/user.

Additional details and impacted files

@@               Coverage Diff               @@
##             feat/user     #558      +/-   ##
===============================================
+ Coverage        62.85%   62.90%   +0.04%     
- Complexity        1621     1622       +1     
===============================================
  Files              136      136              
  Lines             8399     8410      +11     
===============================================
+ Hits              5279     5290      +11     
  Misses            3120     3120              

Files with missing lines	Coverage Δ
...kages/Domains/User/Factory/SubscriptionFactory.php	100.00% <100.00%> (ø)
...ackages/Domains/User/Factory/UserEntityFactory.php	100.00% <100.00%> (ø)
...mains/User/Tests/Factory/UserEntityFactoryTest.php	100.00% <100.00%> (ø)

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[zigzagdev]

Ok