Add app source and tests

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

lib/Peach/see/docker/manager/DockerManager.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/cupertino.dart';
+
+import '../../../about/internal/application/ServerProfile.dart';
+import 'DockerManagerState.dart';
+
+/// See, start/stop/restart, inspect logs and remove Docker containers — and
+/// install Docker if it's missing.
+class DockerManager extends StatefulWidget {
+  final ServerProfile server;
+
+  const DockerManager({super.key, required this.server});
+
+  @override
+  State<DockerManager> createState() => DockerManagerState();
+}