Add app source and tests

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

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

@@ -0,0 +1,24 @@
+/// A single Redis key's type, TTL and (formatted) value.
+class RedisEntry {
+  final String key;
+  final String type; // string | list | set | hash | zset | stream | none
+  final String ttl; // seconds, -1 (no expiry), -2 (missing)
+  final String value;
+  RedisEntry({
+    required this.key,
+    required this.type,
+    required this.ttl,
+    required this.value,
+  });
+
+  String get ttlLabel {
+    final n = int.tryParse(ttl.trim());
+    if (n == null) return ttl;
+    if (n == -1) return 'no expiry';
+    if (n == -2) return 'missing';
+    if (n < 60) return '${n}s';
+    if (n < 3600) return '${(n / 60).floor()}m ${n % 60}s';
+    if (n < 86400) return '${(n / 3600).floor()}h';
+    return '${(n / 86400).floor()}d';
+  }
+}