Add Easy SteamGrid (Linux)

[j65zyj9ys4-sudo]

Adds Easy SteamGrid (Linux) — a SteamGridDB integration plugin for Steam on Linux, applying custom grids, heroes, logos, and icons, including animated artwork with zero conversion (no Python/Pillow, no local server).

Not a GitHub fork of the existing steam-easygrid entry — it's an independently maintained repo, though the codebase originated from luthor112/steam-easygrid (credited in the README; MIT license inherited from the original). Named steam-easygrid-linux specifically to avoid colliding with the plugins/steam-easygrid submodule already in this database.

Highlights:

• Animated WebP artwork renders natively via Steam's own SetCustomArtworkForApp, using SteamGridDB's -fakepng.png CDN variant — no conversion, no local HTTP server
• Chunked IPC transfer supports any file size, applies instantly with no restart required
• Icon support via librarycache overwrite with automatic backup/restore
• Tested on CachyOS / KDE Plasma 6 (Wayland); a minimal, untested Windows path also exists

Repo: https://github.com/j65zyj9ys4-sudo/steam-easygrid-linux