[Feature Request] Sync a GitHub Project with a NextCloud Deck Board

Being able to create a board that syncs with a pre-existing GitHub project.

I would envision the experience being:

• You could "Create a NextCloud Deck from a GitHub Project" (The first implementation could just be creating a Deck from a GitHub Project without sync'ing, since that is already useful)
• Data imported into DeckCloud could be: Title, Description, Tags. Comments and assignees would be cool, but not sure if Nextcloud would allow that.
• GitHub Projects also uses a Kanban layout, so columns could be recreated in the same manner. Moving a task from one column to the next in NextCloud would update GitHub.
• 2-way syncing: GitHub hooks could update the deck when GitHub updates, and vice versa.

This feature was also mentioned in the NextCloud Deck repo, but figured it would be useful to mention here since this app would likely be the one doing the work.

该 issue 未指明文件、测试或入口点。首先检查现有的 GitHub 集成和链接的 Nextcloud Deck issue，然后确定第一阶段的实现边界。完成的要求是：就导入项目和列的范围达成一致，并明确规定同步行为和支持的数据。