組課功能

於`new-feature-events`開發

組課，像揪團，所以是，有一個介面能讓符合標準的發起能被符合標準的人看到，一個過程：

1. 舉旗（發起未定邀請合作）。
2. 插旗（確認方案開放報名）。
3. 收旗（揪團完成可以結揪）。

The issue describes a multi-step group class feature (flag-raising, flag-planting, flag-collecting) to be developed in the 'new-feature-events' branch. Start by examining the existing event or group collaboration models in the codebase to understand the data structures. Look for any existing UI components for creating and managing events. Determine what '符合標準' (meeting criteria) means for both initiators and participants. The feature will require backend logic for the workflow and frontend interfaces for each step.

Scritto dal modello di indicizzazione a partire dal testo della issue.