Add Nextcloud Assistant (AI app) support

**Is your feature request related to a problem? Please describe.**
Is there any plan to integrate Nextcloud Assistant within Talk iOS? I see 3 main use cases:
1. Same features as on Talk desktop, so suggest message to write, summarize, etc
2. An LLM chat thread that can be used sort of like a local ChatGPT/HuggingChat, but from the comfort of the Talk UI with the ability to refer to files stored on Nextcloud [this would especially be very cool, I've experimented with it a few months back by calling an LLM through a local API server but I had to start every message with a prefix that would then call a Talk bot]
3. Being able to call an LLM from within a chat with other people too, sort of like a Telegram group chat with a bot

**Describe the solution you'd like**
LLamaTalk. Or TalkGPT. Anyway, easy access to LLMs within Talk iOS.

**Describe alternatives you've considered**
Writing a custom Talk bot, using other services.

**Additional context**
🤖😎