[FEATURE] Support default orientation templates for custom phone apps

[ifBars]

What would you like to see?

Add clearer S1API support for choosing the default orientation/template used by custom PhoneApp instances.

A modder reported that overriding phone app orientation rotates the phone, but the app canvas remains sideways. Based on the current API behavior, PhoneApp.Orientation affects phone rotation/camera offset when the app opens, but custom app panels are still cloned from ProductManagerApp in SpawnUI.

It would help to provide an API-supported way to create a vertical or horizontal phone app canvas by default, likely by cloning from an appropriate native app/template for the requested orientation. If runtime orientation changes are also supported later, the API should document that per-app UI layout, resizing, and scaling may still need to be handled by the mod.

Why would this help?

Right now, modders can see an orientation option in the API/docs, but it is not obvious that this only handles phone rotation/camera offset and does not necessarily produce a correctly oriented/resized canvas for the app UI.

This makes portrait-style phone apps confusing to build: a modder may override orientation and expect S1API to provide a vertical canvas, but instead their UI can remain laid out sideways because the cloned app canvas/template came from a horizontal app.

Extra Context (Optional)

Community report summary:

• A modder tried changing a phone app's orientation via override.
• The phone rotated, but the app canvas was sideways.
• They asked whether an additional step was required or whether they needed to manually rotate/resize the UI.
• Current maintainer understanding: orientation currently affects the phone/app state, while resizing/rotating UI is likely not handled automatically by the game and may need to be handled per app.

Current repo context:

• S1API/PhoneApp/PhoneApp.cs exposes protected virtual EOrientation Orientation => EOrientation.Horizontal;.
• SetAppOpen uses Orientation to call Phone.Instance.SetIsHorizontal(true) for horizontal apps and adjust look offset.
• SpawnUI currently clones AppsCanvas/ProductManagerApp for custom phone apps.
• S1API/docs/phone-app.md currently says overriding Orientation to Vertical creates portrait-style apps and that S1API adjusts phone rotation/camera offset.

Possible acceptance criteria:

• S1API provides a supported way to choose vertical vs. horizontal default phone app layout/template.
• The docs clearly distinguish phone rotation from canvas/UI layout responsibilities.
• If runtime orientation changes are exposed, the docs explain what S1API handles and what the app/modder must handle manually.