Support d1 http api

[NeoPrint3D]

Some of my projects are across accounts due to some money constraints. It would be nice to use the d1 HTTP API to bind it so that it isn't account dependent and add it as an env or something

[iBobik]

And better - allow to connect to any database using the public instance d1-manager.pages.dev, so we does not need to deploy it ourself.

Just paste connection string and LLM credentiials to the form or URL, so we can bookmark it:

https://d1-manager.pages.dev/#DB=xxx;OPENAI_API_KEY=xxx

As it works client-side it should not leak my credentials, shouldn’t it?