redirect_uri の追加ができない

redirect_uri はカンマ区切りで複数登録可能だが、現状は新規登録時にしか登録ができない。
テスト環境→本番環境の切替等で、後から追加したいケースがあるため、編集機能が欲しい

The issue names no file or test. Start by locating the PHP registration and edit entry points that handle comma-separated redirect_uri values, then trace the existing create behavior. Done means an existing registration can add redirect_uri values for environment changes, with coverage for editing and preserving multiple comma-separated URIs.

Written by the indexing model from the issue text.