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>

videodb/docker-entrypoint.sh

@@ -6,6 +6,7 @@ DB_USER="${DB_USER:-videodb}"
 DB_PASSWORD="${DB_PASSWORD:-videodb_secret}"
 DB_NAME="${DB_NAME:-videodb}"
 DB_PREFIX="${DB_PREFIX:-videodb_}"
+INGEST_API_TOKEN="${INGEST_API_TOKEN:-changeme}"
 
 CONFIG_FILE="/var/www/html/config.inc.php"
 
@@ -55,6 +56,7 @@ cat > "$CONFIG_FILE" <<PHP
 \$config['xls_extra_fields'] = 'title (plot), diskid, genres, language, mediatype, runtime, year, custom1, custom2, custom3, custom4, insertdate, owner, lent';
 \$config['dvdb_user'] = '';
 \$config['dvdb_password'] = '';
+\$config['ingest_api_token'] = '${INGEST_API_TOKEN}';
 PHP
 
 chown www-data:www-data "$CONFIG_FILE"