Add Docky plugin

[datbird]

Add Docky to Plugin Store

Docky is a Steam Deck automation plugin on a Task ‚ Action ‚ Mode model, run manually or by triggers (dock/undock, AC power, controller connect, resume, startup). It ships built-in dock fixes (docked-audio sink switch, controller order, gamescope composition/stretch, TDP cap), a temp‚ RPM fan-control engine with named profiles, and full Sunshine game-streaming control.

How it differs from decky-sunshine: decky-sunshine only starts/stops Sunshine. Docky is a broader automation framework whose Sunshine support is one integrated Action ‚it can drive Sunshine directly or defer to decky-sunshine ‚ and adds self-healing mDNS discovery, capture-health recovery, and Sunshine‚ Desktop GPU coexistence not offered elsewhere.

Root disclosure: Docky declares flags:["root"]. For Sunshine KMS capture, it creates a setuid-root copy of the system's own bwrap under /var/lib/docky (root-owned chain; /tmp and /run are nosuid on SteamOS). Rationale and the security hardening (TOCTOU guards, clean_env, subprocess timeouts) are in docs/design-notes.md and docs/decky-integration.md. It bundles no third-party binaries ‚ the backend is pure Python, the frontend builds from source.

Repo: https://github.com/datbird/docky (v1.4.7)

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.

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