feat: Support creating projects during init

[justinvdm]

UX changes:

• One can now create a new project during npx @snaplet/seed init instead of needing to choose existing projects
• One can change to a different project with npx @snaplet/seed link
• note: npx @snaplet/seed init no longer skips prompting if you only have a single project - we now prompt regardless. This is to allow users to choose whether they want to create a new project instead of using this 1 project they already have (heads up @CarelFdeWaal)

Short demo: https://www.loom.com/share/e646ad45b63346bc8cf9352950cb4466

[linear[bot]]

S-2030 Support creating projects during `init`

Right now, when the user `snaplet/seed init`'s, they can only choose existing projects. Creating new projects (for the data given back by the AI) for their new project isn't possible. [https://discord.com/channels/788353076129038346/914821651017908234/1226838023967342643](https://discord.com/channels/788353076129038346/914821651017908234/1226838023967342643)

[justinvdm]

Fixes S-2031