Add Decky Prism

[shadeov]

Add Decky Prism to Plugin Store

Decky Prism syncs Prism Launcher Minecraft instances into the Steam library as non-Steam shortcuts.

From the Quick Access menu you can pick which instances to include, launch them, and keep playtime/group info in sync. Artwork comes from SteamGridDB when an API key is set; otherwise the plugin builds capsule and wide covers from the instance icon. It can also install Prism Launcher as a user Flatpak, force fullscreen before launch, and sort instances by several orders (name, last played, playtime, Prism groups).

There is no existing store plugin for Prism → Steam. This is a standard Decky Python backend and React frontend. No custom binaries.

Repo: https://github.com/shadeov/decky-prism
Release zip: https://github.com/shadeov/decky-prism/releases/tag/v1.0.0
Store image: https://raw.githubusercontent.com/shadeov/decky-prism/main/docs/images/preview.png

I have been running it on a Steam Deck with Decky Loader.

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have abided by the licenses of the libraries I am utilizing, including attaching license notices where appropriate.
• Generative AI was NOT used to write a majority of the code I am submitting.

Plugin

• I have verified that my plugin works properly on the Stable and Beta update channels of SteamOS.
• I have verified my plugin is unique or provides more/alternative functionality to a plugin already on the store.

Backend

• No: I am using a custom backend other than Python.
• No: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked.
• No: I am using a custom binary that has all of it's dependencies statically linked.

Community

• I have tested and left feedback on two other pull requests for new or updating plugins.
• I have commented links to my testing report in this PR.

Testing

• Tested by a third party on SteamOS Stable or Beta update channel.

[github-actions]

Issues Found

No issues with your PR description were found.

Next Steps

1. If we found any issues above, please edit your pull request description to resolve them and leave a comment saying you've done so.
2. For the quickest review, please see the Community section of the pull request template for how you can help other developers.
3. Once your description is correct, a maintainer will review your pull request as soon as possible.

Thank you for your contribution! If you need any help, please reach out on our Discord server. ❤️