chore(medcat-trainer): Enable livereloading in dev

[alhendrickson]

What does this do

Adds livereload to the dev docker compose, if an env var is set.

• Run with docker compose -f docker-compose-dev.yml up -d
• Edit a py file
• Trainer restarts the backend API

2026-03-09 11:15:07.461 | [medcattrainer] /home/api/api/views.py changed, reloading.
2026-03-09 11:15:07.461 | [medcattrainer] INFO 2026-03-09 11:15:07,460 autoreload.py l:265:/home/api/api/views.py changed, reloading.
2026-03-09 11:15:07.461 | [medcattrainer] Performing system checks...
2026-03-09 11:15:07.461 | [medcattrainer] 
2026-03-09 11:15:07.461 | [medcattrainer] System check identified no issues (0 silenced).
2026-03-09 11:15:07.461 | [medcattrainer] March 09, 2026 - 11:14:26
2026-03-09 11:15:07.461 | [medcattrainer] Django version 5.2.11, using settings 'core.settings'
2026-03-09 11:15:07.461 | [medcattrainer] Starting development server at http://0.0.0.0:8000/
2026-03-09 11:15:07.462 | [medcattrainer] Quit the server with CONTROL-C.
2026-03-09 11:15:07.462 | [medcattrainer] 
2026-03-09 11:15:07.462 | [medcattrainer] WARNING: This is a development server. Do not use it in a production setting. Use a production WSGI or ASGI server instead.
2026-03-09 11:15:07.462 | [medcattrainer] For more information on production servers see: https://docs.djangoproject.com/en/5.2/howto/deployment/
2026-03-09 11:15:14.955 | [medcattrainer] INFO 2026-03-09 11:15:14,954 config.py l:59:PyTorch version 2.10.0+cpu available.
2026-03-09 11:15:15.349 | [medcattrainer] INFO 2026-03-09 11:15:15,349 apps.py l:35:MedCATTrainer App API ready...

Discussion

Looks like this was handled by a .vscode launch config before - would be great to write up some local dev instructions for frontend/backend.

[mart-r]

Looks good to me