Add phone-based EAN scanning, scanner server for cover upload, Vision-LLM integration

New features:
- EAN/Barcode can now be entered by typing or by photographing the CD sleeve;
  Vision-LLM (extract_barcode_from_image) reads the barcode from the photo
- Scanner server (port 8765) starts at the beginning of every album loop,
  serving both EAN barcode scanning and back cover upload via QR code
- Vision-LLM analyses back cover in background thread while ripping;
  priority: Vision-LLM > MusicBrainz > CDDB
- _find_abcde_mbid reads MBID from abcde temp dirs for CAA cover download
  even when the CD barcode is not linked in MusicBrainz
- Concrete copy-paste apply commands shown after each album in 'Next steps'
- _sanitize_name: whitelist approach (removes brackets and punctuation)
- qrcode added as dependency for terminal QR code display

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

pyproject.toml

@@ -13,6 +13,7 @@ dependencies = [
     "mutagen>=1.47",
     "Pillow>=10.0",
     "httpx>=0.27",
+    "qrcode>=7.0",
 ]
 
 [project.optional-dependencies]