Add app source and tests

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

lib/Peach/about/external/data/Docker.dart

@@ -0,0 +1,56 @@
+class DockerStatus {
+  final bool installed;
+  final bool running;
+  final String version;
+  DockerStatus(this.installed, this.running, this.version);
+}
+
+class DockerContainer {
+  final String id;
+  final String name;
+  final String image;
+  final String state; // running | exited | created | paused | restarting | dead
+  final String status; // e.g. "Up 2 hours" / "Exited (0) 3 min ago"
+  final String ports;
+
+  DockerContainer({
+    required this.id,
+    required this.name,
+    required this.image,
+    required this.state,
+    required this.status,
+    required this.ports,
+  });
+
+  bool get up => state.toLowerCase() == 'running';
+}
+
+/// Everything needed to `docker run` a new container.
+class DockerRunSpec {
+  String image;
+  String name;
+  String ports; // "host:container" per line
+  String env; // "KEY=VALUE" per line
+  String volumes; // "host:container" per line
+  String restart; // no | on-failure | always | unless-stopped
+  bool detached;
+  String command;
+
+  DockerRunSpec({
+    this.image = '',
+    this.name = '',
+    this.ports = '',
+    this.env = '',
+    this.volumes = '',
+    this.restart = 'unless-stopped',
+    this.detached = true,
+    this.command = '',
+  });
+
+  List<String> _lines(String s) =>
+      s.split('\n').map((e) => e.trim()).where((e) => e.isNotEmpty).toList();
+
+  List<String> get portList => _lines(ports);
+  List<String> get envList => _lines(env);
+  List<String> get volumeList => _lines(volumes);
+}