feat(plugins): punktfunk-host plugins CLI — add/remove/list/enable/disable/status

One-liner plugin management replacing the manual scripting-dir + bunfig +
bun-add ritual: package ops forward to the bun runner (new sdk plugins
module + runner-cli subcommands, 11 tests green), enable/disable/status
drive the systemd unit on Linux and the PunktfunkScripting scheduled task
on Windows (installer support in the ISS). Docs page rewritten as .mdx
with per-platform Tabs (registered in mdx.tsx).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs-site/content/docs/automation.md

@@ -149,7 +149,8 @@ directory of scripts and installed plugins as one service: crash-restarts with b
 for the five-line quickstart and unit templates.
 
 For ready-made plugins — sync your ROM collection or your Playnite library into the game library,
-with a console page to manage them — see [Plugins](/docs/plugins).
+with a console page to manage them — see [Plugins](/docs/plugins). Installing one is two commands:
+`punktfunk-host plugins add <name>`, then `punktfunk-host plugins enable`.
 
 The canonical "decide, don't just observe" pattern — approve pairing from your phone: watch
 `pairing.pending`, send yourself a notification, and call