fix(system-accounts): 修复省市系统账户自动创建的数据流问题

1. contribution-service: 修复 CITY 类型账户的 provinceCode 映射
   - 之前 CITY 的 provinceCode 被错误设为 cityCode
   - 现在正确传递 provinceCode 用于创建省份

2. mining-wallet-service: 修复系统账户创建事件的 topic
   - 之前发布到 mining-wallet.system-account.created
   - 现在发布到 cdc.mining-wallet.outbox 供 mining-admin-service 同步

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

backend/services/contribution-service/src/application/services/contribution-distribution-publisher.service.ts

@@ -121,13 +121,14 @@ export class ContributionDistributionPublisherService {
     return result.systemContributions.map((sys) => ({
       accountType: sys.accountType,
       amount: sys.amount.value.toString(),
-      // 直接使用 regionCode，没有就用传入的参数
+      // 省份代码：PROVINCE 用自己的 regionCode，CITY 需要传递省份代码用于创建省份
       provinceCode:
         sys.accountType === 'PROVINCE'
           ? sys.regionCode || provinceCode
           : sys.accountType === 'CITY'
-            ? sys.regionCode || cityCode
+            ? provinceCode  // CITY 需要省份代码来创建省份（如果省份不存在）
             : undefined,
+      // 城市代码：只有 CITY 类型有
       cityCode:
         sys.accountType === 'CITY' ? sys.regionCode || cityCode : undefined,
       neverExpires: sys.accountType === 'OPERATION', // 运营账户永不过期

backend/services/mining-wallet-service/src/application/services/contribution-wallet.service.ts

@@ -396,13 +396,13 @@ export class ContributionWalletService {
       });
       this.logger.log(`Auto-created province system account: ${account.code}`);
 
-      // 发布系统账户创建事件到 Outbox
+      // 发布系统账户创建事件到 Outbox（用于 mining-admin-service 同步）
       await tx.outboxEvent.create({
         data: {
           aggregateType: 'SystemAccount',
           aggregateId: account.id,
           eventType: 'WalletSystemAccountCreated',
-          topic: 'mining-wallet.system-account.created',
+          topic: 'cdc.mining-wallet.outbox',
           key: account.code,
           payload: {
             id: account.id,
@@ -481,13 +481,13 @@ export class ContributionWalletService {
       });
       this.logger.log(`Auto-created city system account: ${account.code}`);
 
-      // 发布系统账户创建事件到 Outbox
+      // 发布系统账户创建事件到 Outbox（用于 mining-admin-service 同步）
       await tx.outboxEvent.create({
         data: {
           aggregateType: 'SystemAccount',
           aggregateId: account.id,
           eventType: 'WalletSystemAccountCreated',
-          topic: 'mining-wallet.system-account.created',
+          topic: 'cdc.mining-wallet.outbox',
           key: account.code,
           payload: {
             id: account.id,