feat: 商品一覧の取得（GET /products）およびメタデータ等の更新（PATCH /products/:id）APIの定義追加 (#45)

[reiroop]

本PRは、Issue #45 に基づき、登録商品の管理API（GET/PATCH /products）および商品/価格（Product/Price）スキーマの定義を追加します。このプルリクエストは #44（feature/issue-43）の上に重ねた（stacked）状態になっています。

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