v2 architecture draft: see `docs/architecture-v2.org`

default v2 app run:
```
python3 ./youdis.py
```

`youdis.py` is the app-level runner. It starts the backend first, waits for health, then starts each enabled adapter explicitly.

direct component runs still work for testing:
```
python3 -m uvicorn youdis.main:app --host 127.0.0.1 --port 8000
python3 -m youdis.adapters.discord
```

adapter selection is controlled by env, currently:
```
YOUDIS_RUN_BACKEND=1
YOUDIS_ENABLED_ADAPTERS=discord
```

to add a new adapter:
1. add `youdis/adapters/<adapter>.py`
2. make it independently runnable
3. add `start_<adapter>()` to `youdis.py`
4. register it in the explicit adapter starter map in `youdis.py`
5. add any required env vars to `.env.example`

build and run the docker container
```
DISCORD_BOT_TOKEN = [discord bot token]
-v [downloads]:/downloads
-v [config]:/config
```
config contains data to persist across container updates, i.e., unraid appdata, 
such as yt-dlp's archive.txt