Add app source and tests

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

lib/Peach/see/kafka/Kafka.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/cupertino.dart';
+
+import '../../about/internal/application/ServerProfile.dart';
+import 'KafkaState.dart';
+
+/// Live Kafka monitoring over SSH: topics with message offsets, consumer
+/// groups with lag, and cluster/broker health. Everything comes from the
+/// standard Kafka CLI tools run on the server.
+class Kafka extends StatefulWidget {
+  final ServerProfile server;
+
+  const Kafka({super.key, required this.server});
+
+  @override
+  State<Kafka> createState() => KafkaState();
+}