feat(auth): use the optional service pattern for auth-dependent layers

[IMax153]

• Moves some models out of Auth.ts and into Model.ts
• Uses Redacted for sensitive tokens
• Removes need for admin URL interpolation
• Uses the optional service pattern to handle token generation in the Admin service
  • Removes a lot of the indirection between Auth <-> Admin, so you can just provide Auth to Admin when you want / need authenticated requests

[IMax153]

@cmwhited - FYI this is what I was referring to by the "optional service pattern"

[fubhy]

Does this PR re-introduce the issue with the Node.js dependencies? Just making sure we don';t break browser usage again.

[fubhy]

LocalCache.ts has a dependency on node:os

[CLAassistant]

All committers have signed the CLA.

[IMax153]

I was able to run the studio without issue, but perhaps I can sync up with @cmwhited when there's time (maybe after you all are back) to understand if there's something I missed / a more thorough way I can test to ensure all works properly.

[leoyvens]

@IMax153 are you blocked here? What do you want to do with this PR?

[IMax153]

@IMax153 are you blocked here? What do you want to do with this PR?

Hey @leoyvens - @cmwhited is going to do a secondary validation that this PR does not affect the functionality of Amp Studio that @fubhy mentioned above either today or tomorrow.

As long as everything is working properly, we should be good to merge this after that.