fix: Component.onCompleted doesn't work on QML Singletons

Replaced with Timer { interval: 0; running: true } in:
- Session.qml (boot IPC audit)
- SessionAudit.qml (init log)
- SessionEvents.qml (init log)

surfaces/quickshell/services/SessionAudit.qml

@@ -214,7 +214,11 @@ Singleton {
         }
     }
 
-    Component.onCompleted: {
-        console.log("[audit] initialized; log at " + root.auditPath);
+    Timer {
+        id: initLogTimer
+        interval: 0
+        repeat: false
+        running: true
+        onTriggered: console.log("[audit] initialized; log at " + root.auditPath)
     }
 }