Add Tonkatsu Box to Open Source Apps — Media Library

[hacan359]

https://github.com/hacan359/tonkatsu_box — open-source collection manager for games, movies, TV shows, anime, visual novels, and manga.

• 6 media types via IGDB, TMDB, VNDB, AniList, SteamGridDB APIs
• Visual canvas boards with drag-and-drop elements and connections
• Tier lists with customizable tiers and PNG export
• Import from Steam, Trakt.tv, RetroAchievements
• Multi-user profiles with isolated databases
• Keyboard shortcuts, gamepad support
• Windows, Linux, Android

Added under a new Media Library subcategory in Open Source Apps.

Checklist

• I read How to contribute
• I edited the SOURCE.md file only
• Added a link to the repo in the PR

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