Feature: Make service available via API

[beautiful-orca]

I like to have a powerful TTS model running on my more powerful server and ask for TTS service from my phone.

The Read Aloud Add-On in Firefox can use OpenAI-compatible Speech API endpoinds. Also Integration into other android Apps would be possible.

[Gyyyn]

Marked for implementation. Thanks for the suggestion! Long term the plan is to support reading webpages directly through the app, like it is possible in Speechify.