feat: new file with prompt

[jimniels]

Summary

Allows people to land on the app and have a file created with a prompt run automatically.

• Any request to /files/create from outside of the app will create a new file for a user.
• If an included prompt search param is included, it will start a file with an AI prompt, e.g. files/create?prompt=generate+some+python+code

Under the hood, this works by this logic:

• See if the user belongs to a team
  • If yes, create a private file in that team
  • If no, create a team first, then create a private file in that team

Also: this PR includes a piece of data on the /acknowledge endpoint which will tell you when a new user was created on that call.

To Test

There are three cases we should test:

1. You're logged in to the app already. It should go from marketing site to app and run prompt in a new private file
2. You're not logged in to the app, but have an account. It should go from marketing site, to login screen, to app and run prompt in a new private file
3. You don't have an account yet. It should go from marketing site, to login page, to sign up page, to app and run prompt in a new private file

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Name	Status	Preview	Updated (UTC)
quadratic	✅ Ready (Inspect)	Visit Preview	Dec 20, 2024 5:17pm

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.82%. Comparing base (a26883a) to head (9c653a4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2121   +/-   ##
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  Coverage   90.82%   90.82%           
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  Files         260      260           
  Lines       57583    57583           
=======================================
  Hits        52297    52297           
  Misses       5286     5286           

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