Rework "Turn on Donations"

# Problem

The UI is confusing. You technically get to "Turn on Donations" before fully setting up the stripe account for the organization

* [ ] Formulate improvements to make the process less confusing
* [ ] Implement

首先檢視組織的「Turn on Donations」流程和 Stripe 帳戶設定步驟。找出 UI 允許在 Stripe 設定完成前啟用捐款的位置，然後在實作之前定義改進後的流程及其完成條件。

由索引模型根據 Issue 內容生成。