chore: scaffold Mudfish VPN decky plugin

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/index.tsx

@@ -0,0 +1,10 @@
+import { PanelSection, staticClasses } from "@decky/ui";
+import { definePlugin } from "@decky/api";
+import { FaFish } from "react-icons/fa";
+
+export default definePlugin(() => ({
+  name: "Mudfish VPN",
+  titleView: <div className={staticClasses.Title}>Mudfish VPN</div>,
+  content: <PanelSection />,
+  icon: <FaFish />,
+}));