feat: 物品割当に貸出場所を追加

[hikahana]

課題と解決策

• assign_rental_items に元の在庫場所しかなく、物品を集約して受け渡す貸出場所を保持できなかった
• assign_rental_items に rental_place_id を追加し、stocker_places を参照する形で貸出場所を保持するようにした
• 物品割当 API、CSV/PDF、旧管理画面の一覧・詳細・編集を貸出場所に対応させた

検証結果

• docker compose run --rm api rails db:migrate
• docker compose run --rm api rails db:migrate RAILS_ENV=test
• docker compose run --rm --no-deps api ruby -c app/models/assign_rental_item.rb app/models/stocker_place.rb app/controllers/assign_rental_items_controller.rb app/controllers/api/v1/assign_rental_items_api_controller.rb app/controllers/api/v1/output_csv_controller.rb db/migrate/20260420000001_add_rental_place_id_to_assign_rental_items.rb test/models/assign_rental_item_test.rb test/controllers/assign_rental_items_controller_test.rb
• docker compose run --rm admin_view npm run build
• 手動 API 確認: GET/POST/PUT/DELETE /assign_rental_items, POST /api/v1/get_refinement_assign_rental_item

補足

• rails test は既存の employees fixture が現行 schema と不整合なため失敗することを確認済み（今回の変更起因ではない）

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 51567469-6442-49eb-9419-4d6002758956

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/assign-rental-items-rental-place

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}