Unify config into shell.json and add Noctalia plugin support

default/quickshell/omarchy-shell/Services/Power/PowerProfileService.qml

@@ -0,0 +1,9 @@
+pragma Singleton
+import QtQuick
+
+// Noctalia compat shim. The "noctaliaPerformanceMode" flag was a v3 internal
+// state Noctalia plugins occasionally check. We hardcode false; plugins that
+// branch on it will fall into the non-performance code path.
+QtObject {
+  readonly property bool noctaliaPerformanceMode: false
+}