Initial commit: 91dj android client dev_1.0.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

analytics_sdk/lib/utils/runtime_observation_stub.dart

@@ -0,0 +1,16 @@
+/// Runtime observation fields for platforms without native observers.
+class RuntimeObservationMonitor {
+  const RuntimeObservationMonitor();
+
+  Future<void> dispose() async {}
+}
+
+Future<Map<String, dynamic>> collectRuntimeObservationFields() async {
+  return const <String, dynamic>{};
+}
+
+RuntimeObservationMonitor startRuntimeObservationMonitoring(
+  void Function(Map<String, dynamic> fields) onFields,
+) {
+  return const RuntimeObservationMonitor();
+}