Add KrakenKeys plugin

[JRugen]

Add KrakenKeys to Plugin Store

Show the best deal through KrakenKeys for the game you are currently viewing in the Steam Store. The plugin adds two compact buttons to the control strip inside Game Mode:

• Lowest price button – Links straight to the active store offer (disabled when Steam already has the best price).
• “X deals” button – Opens the KrakenKeys game page so players can compare every storefront.

All lookups are performed live against the public KrakenKeys API, and you can optionally exclude key shops with a toggle in the plugin settings.

Features:

• Detects the current Steam AppID
• Calls https://krakenkeys.com/api/v1/steam-deck/deal with the AppID, detected currency (GBP/EUR/USD, default USD), and the key-shop preference.
• Automatically disables the “best price” button when Steam is already cheapest.
• Overlay that fits inside the control strip and respects Steam’s UI layout.

This plugin is similar to IsThereAnyDeal Plugin. Rather than using ITAD, it uses KrakenKeys. This means the data comes from a different source, and the deals cover a wider range of stores. The user also has the ability to toggle keyshops on and off.

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.

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.
• Update isthereanydeal-for-deck to v1.0.5 #898 (comment)

Testing

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

[github-actions]

Issues Found

• Both testing boxes are present in your description. Please remove one of them per the Markdown comment above the testing section.

Next Steps

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[JRugen]

Fixed the issue found by removing the correct testing checkbox. Apologies.

[EMERALD0874]

Keyshop links are not ethically comfortable for the Decky Loader team to host on the plugin store per a decision made here. If the plugin is edited to disable keyshop links with no way to enable them, we will review this PR. You're welcome to make a branch specific to the plugin store and PR with that. That way, you don't need to edit your plugin as a whole for non-plugin store use.

There may be more changes requested, but I wanted to start with the most important issue.

[JRugen]

Keyshop links are not ethically comfortable for the Decky Loader team to host on the plugin store per a decision made here. If the plugin is edited to disable keyshop links with no way to enable them, we will review this PR. You're welcome to make a branch specific to the plugin store and PR with that. That way, you don't need to edit your plugin as a whole for non-plugin store use.

There may be more changes requested, but I wanted to start with the most important issue.

Noted - thank you. I'll update the plugin to only retrieve official storefronts data. Appreciate the heads up!