feat: Discogs music scraper plugin (#87)

[fabiodalez-dev]

Summary

New optional plugin that integrates with the Discogs API for music metadata scraping (CD, LP, vinyl, cassette).

Closes #87

How it works

• Registers as a scraping source via the existing hook system (scrape.sources, scrape.fetch.custom, scrape.data.modify)
• Searches by barcode (EAN) first (most reliable for physical media), falls back to title search
• Fetches full release details and maps to Pinakes fields:

Discogs	Pinakes
Artists	Autore
Labels	Editore
Year	Anno pubblicazione
Tracklist	Descrizione
Images	Copertina
Barcode	EAN
Genres	Genere
Format (CD/Vinyl/etc)	Formato

Configuration

• Optional Discogs personal access token (Settings > Plugin) for 60 req/min instead of 25
• No token required for basic functionality
• 1-second delay between API calls for rate limiting

Files

• storage/plugins/discogs/DiscogsPlugin.php — Main plugin class
• storage/plugins/discogs/wrapper.php — PluginManager compatibility wrapper
• storage/plugins/discogs/plugin.json — Plugin manifest
• storage/plugins/discogs/README.md — Documentation
• .gitignore — Added discogs plugin exceptions

Test plan

• Install and activate plugin from Admin > Plugins
• Search a music CD by barcode (EAN)
• Search a vinyl record by title
• Verify cover, tracklist, artist, label are populated
• Verify rate limiting (1s between requests)
• Test without API token (should work with 25 req/min limit)
• PHPStan level 1 passes

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Discogs-backed music scraper with MusicBrainz/Deezer cover enrichment and admin-configurable API token; plugin install/activation UI.

• UI Improvements

  • Media-type (tipo_media) support across import/export, filters, badges/icons, media-aware detail pages (MusicAlbum schema, tracklist formatting) and settings page with token redaction.

• Localization

  • Added IT/EN/DE translations for media/music labels and messages.

• Tests

  • Multiple Playwright E2E suites for scraping, import, media-type and plugin flows.

• Chores

  • DB migration adding tipo_media and composite index; installer/updater and plugin loading robustness improvements.