fix(pricing): 修复 priceSupplement 在 Kafka 事件链中丢失的问题

## 问题描述

认种树动态定价涨价功能 (ed6b48562) 在 planting-service 的资金分配
中正确计算了 HQ_PRICE_SUPPLEMENT，但 priceSupplement 字段未随
Kafka 事件传递到 reward-service，导致 reward-service 的
calculateHqPriceSupplement 永远收到 priceSupplement=0，涨价部分
的总部奖励分配不会执行。

## 事件链路径 (修复前 → 修复后)

  planting-service (contract-signing.service.ts)
    ↓ contract.signed / contract.expired
    ↓ 修复前: 不含 priceSupplement ❌
    ↓ 修复后: 携带 order.priceSupplement ✅
  referral-service (contract-signing.handler.ts)
    ↓ planting.order.paid / planting.order.expired
    ↓ 修复前: 不含 priceSupplement ❌
    ↓ 修复后: 透传 eventData.priceSupplement || 0 ✅
  reward-service (event-consumer.controller.ts)
    ↓ calculateHqPriceSupplement(priceSupplement)
    ↓ 修复前: 始终为 0，不分配 ❌
    ↓ 修复后: 收到实际值，正确分配给 S0000000001 ✅

## 修改文件

1. planting-service/src/infrastructure/kafka/event-publisher.service.ts
   - ContractSigningEventData 接口新增 priceSupplement?: number 字段

2. planting-service/src/application/services/contract-signing.service.ts
   - signContract(): publishContractSigned 时传递 order.priceSupplement
   - handleExpiredTasks(): publishContractExpired 时传递 order.priceSupplement

3. referral-service/src/application/event-handlers/contract-signing.handler.ts
   - ContractSigningEvent 接口新增 priceSupplement?: number 字段
   - publishOrderPaidEvent(): 透传 priceSupplement 到 planting.order.paid
   - publishOrderExpiredEvent(): 透传 priceSupplement 到 planting.order.expired

## 向后兼容

- priceSupplement 为可选字段 (?: number)，默认 fallback 为 0
- 已存在的订单 priceSupplement=0，不影响现有分配逻辑
- reward-service event-consumer 已有 || 0 fallback 保护

## 验证方法

1. 设置 supplement > 0 后创建认种订单
2. 签署合同后检查 reward-service 日志是否有 HQ_PRICE_SUPPLEMENT 分配记录
3. 检查总部账户 S0000000001 是否收到 priceSupplement * treeCount 的入账

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/services/planting-service/src/application/services/contract-signing.service.ts

@@ -329,6 +329,7 @@ export class ContractSigningService {
       provinceCode: task.provinceCode,
       cityCode: task.cityCode,
       signedAt: task.signedAt?.toISOString(),
+      priceSupplement: order.priceSupplement,
     });
   }
 
@@ -411,6 +412,7 @@ export class ContractSigningService {
           provinceCode: task.provinceCode,
           cityCode: task.cityCode,
           expiredAt: new Date().toISOString(),
+          priceSupplement: order.priceSupplement,
         });
 
         count++;

backend/services/planting-service/src/infrastructure/kafka/event-publisher.service.ts

@@ -38,6 +38,8 @@ export interface ContractSigningEventData {
   cityCode: string;
   signedAt?: string;   // contract.signed
   expiredAt?: string;  // contract.expired
+  // [2026-02-26] 总部运营成本压力涨价（每棵树加价金额），归总部 (S0000000001)
+  priceSupplement?: number;
 }
 
 @Injectable()

backend/services/referral-service/src/application/event-handlers/contract-signing.handler.ts

@@ -16,6 +16,8 @@ interface ContractSigningEvent {
     cityCode: string;
     signedAt?: string;   // contract.signed
     expiredAt?: string;  // contract.expired
+    // [2026-02-26] 总部运营成本压力涨价（每棵树加价金额），归总部 (S0000000001)
+    priceSupplement?: number;
   };
 }
 
@@ -177,6 +179,7 @@ export class ContractSigningHandler implements OnModuleInit {
               provinceCode: eventData.provinceCode,
               cityCode: eventData.cityCode,
               paidAt: eventData.signedAt || new Date().toISOString(),
+              priceSupplement: eventData.priceSupplement || 0,
             },
           },
         });
@@ -245,6 +248,7 @@ export class ContractSigningHandler implements OnModuleInit {
               provinceCode: eventData.provinceCode,
               cityCode: eventData.cityCode,
               expiredAt: eventData.expiredAt || new Date().toISOString(),
+              priceSupplement: eventData.priceSupplement || 0,
             },
           },
         });