Add app source and tests

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

lib/Peach/see/systemd/Systemd.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/cupertino.dart';
+
+import '../../about/internal/application/ServerProfile.dart';
+import '../../about/internal/application/ServiceConfig.dart';
+import 'SystemdState.dart';
+
+/// Step-by-step builder that generates a systemd `.service` unit, previews it,
+/// then registers it (daemon-reload → enable → start → status).
+class Systemd extends StatefulWidget {
+  final ServerProfile server;
+
+  /// Prefills the form and, once the unit registers, has its `serviceName`
+  /// updated so deploys and log views use the new unit.
+  final ServiceConfig? service;
+
+  const Systemd({super.key, required this.server, this.service});
+
+  @override
+  State<Systemd> createState() => SystemdState();
+}