Initial commit: 91dj android client dev_1.0.0

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

analytics_sdk/lib/entity/sdk_init_event.dart

@@ -0,0 +1,32 @@
+import 'dart:convert';
+
+import 'package:analytics_sdk/const/event_type.dart';
+import 'package:analytics_sdk/manager/sdk_context.dart';
+
+/// SDK 初始化快照事件。
+///
+/// `sdk_init` 不携带 `device_env`，硬件与环境快照字段直接写入 payload。
+class SdkInitEvent {
+  final String event = EventType.sdkInit.event;
+  late final String eventId;
+
+  final Map<String, dynamic> payload;
+
+  late final Map<String, dynamic> _commonFields;
+
+  SdkInitEvent({required Map<String, dynamic> payload})
+      : payload = Map<String, dynamic>.from(payload) {
+    _commonFields = SdkContext.generateCommonFields(event);
+    eventId = SdkContext.generateEventIdFromCommonFields(_commonFields, [
+      jsonEncode(this.payload),
+    ]);
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      ..._commonFields,
+      'event_id': eventId,
+      'payload': payload,
+    };
+  }
+}