feat(linux): preserve Service state across upgrades and surface failures

Reinstall an existing Service while keeping its enabled, runtime-masked
and active state. Detect, from the journal, a running Service removed by
a previous deb prerm and reinstall it with its recorded group. Package
script output never reaches the app, so leave a /run marker that makes
the app offer a reinstall once when the Service is not ready.

Hold the core lifecycle until the package manager exits, even after the
startup install times out, so no core start overlaps the Service
reinstall; restart the app once a late install succeeds.

Refs #8515

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src-tauri/src/utils/resolve/mod.rs

@@ -78,6 +78,8 @@ async fn resolve_setup() {
 
     let core_init = AsyncHandler::spawn(|| async {
         init_core_manager().await;
+        #[cfg(target_os = "linux")]
+        crate::core::service::notify_incomplete_service_upgrade().await;
     });
 
     let _ = futures::join!(