feat: Customerスキーマの全プロパティを必須化し、traq_idをnullableに設定 (#15)

[reiroop]

本PRは、Issue #15 に基づき、Customer スキーマ内のすべてのプロパティ（id, traq_id, email, name）を required に指定し、かつ一部省略可能なフィールドである traq_id に nullable: true を指定します。本ブランチは #53 (feature/issue-50) の上に重ねています。

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