feat: add macOS disc scanner + API ingest endpoint

- scanner/scan_disc.py: polls optical drive via drutil, detects disc type
  (DVD/Blu-ray/Audio CD/Data CD), reads volume label, file/track count,
  posts to remote API, auto-ejects. Pure Python + requests, no drivers.
- scanner/requirements.txt + README.md: setup and usage docs
- videodb/api_ingest.php: authenticated POST endpoint that writes disc
  records directly into the videoDB MySQL schema; token stored in config
- docker-compose.yml: adds INGEST_API_TOKEN env var
- docker-entrypoint.sh: writes ingest_api_token into config.inc.php

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scanner/requirements.txt

@@ -0,0 +1 @@
+requests>=2.28