fix(reporting): remove userId dependency in planting.order.paid handler

- Change userId to optional in PlantingOrderPaidEvent interface
- Add accountSequence field for user identification
- Remove relatedUserId from activity creation (was causing BigInt error)
- Store accountSequence in metadata instead

Fixes: TypeError: Cannot convert undefined to a BigInt

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/reporting-service/src/infrastructure/kafka/activity-event-consumer.controller.ts

@@ -68,10 +68,12 @@ interface AuthorizationRoleEvent {
  * 认种订单支付事件 (planting-service)
  * Topic: planting.order.paid
  * 注意：planting-service 发送的消息是直接数据，不包含 payload 包装
+ * [2026-01-05] 更新：移除 userId 依赖，改用 accountSequence
  */
 interface PlantingOrderPaidEvent {
   orderId: string;
-  userId: string;
+  userId?: string;           // 可能为空，不依赖此字段
+  accountSequence?: string;  // 用户账户序列号
   treeCount: number;
   provinceCode?: string;
   cityCode?: string;
@@ -244,6 +246,7 @@ export class ActivityEventConsumerController {
    * 监听认种订单支付成功事件 (planting-service)
    * Topic: planting.order.paid
    * 注意：planting-service 发送的消息是直接数据，不包含 payload 包装
+   * [2026-01-05] 更新：移除 relatedUserId，改用 accountSequence 存入 metadata
    */
   @MessagePattern('planting.order.paid')
   async handlePlantingOrderPaid(@Payload() message: PlantingOrderPaidEvent) {
@@ -253,17 +256,18 @@ export class ActivityEventConsumerController {
       // planting-service 直接发送数据，不包装在 payload 中
       const data = message;
 
-      // 记录活动日志
+      // 记录活动日志 - 不依赖 userId，使用 accountSequence
       await this.activityRepo.create({
         activityType: 'planting_order' as ActivityType,
         title: '认种订单',
         description: `用户认种了 ${data.treeCount} 棵榴莲树`,
         icon: '🌳',
-        relatedUserId: BigInt(data.userId),
+        // 不设置 relatedUserId，因为 userId 可能为空
         relatedEntityType: 'order',
         relatedEntityId: data.orderId,
         metadata: {
           orderId: data.orderId,
+          accountSequence: data.accountSequence,
           treeCount: data.treeCount,
           totalAmount: data.totalAmount,
           provinceCode: data.provinceCode,