feat: デフォルトセキュリティ定義を NeoShowcaseAuth のみに制限し、一般ユーザー向けエンドポイントの認証を個別定義化 (#49)

[reiroop]

本PRは、Issue #49 に基づき、グローバルデフォルトセキュリティを NeoShowcaseAuth のみに制限し、一般ユーザー向け状態変更エンドポイント（POST/PATCH /me/customer, POST /me/invoices）に個別セキュリティ定義を追加します。本ブランチは #48 (feature/issue-46) の上に重ねています。

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