feat(cli): Use well-known endpoint to resolve API

[bo0tzz]

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[bo0tzz]

Would fix #6487, #6731

[bo0tzz]

The fallback logic for constructing the URL is a bit more complex than I'd anticipated. For example, this code currently doesn't handle cases where .well-known returns successfully but builds an invalid endpoint.

[etnoy]

I'm not exactly sure what well-known does. Could you summarize the idea here?

[jrasm91]

The API is served at /api usually, but it you type in the root path / to the mobile app, there is a special endpoint (/.well-known/immich) that can check instead and it returns a response that indicates where the API is actually located. It is like a special discovery endpoint that can be used so the user isn't required to remember to add /api