fix(reward): 修复 accountSequence 转 userId 时字母前缀导致的 BigInt 转换失败

问题描述:
- 社区权益激活后，用户收不到奖励
- 错误: SyntaxError: Cannot convert D25121400002 to a BigInt
- 原因: accountSequence 格式为 D25121400002 (D+日期+序号)，直接 BigInt() 转换失败

修改方案:
- 新增 parseAccountSequenceToUserId() 辅助方法
- 如果 accountSequence 以字母开头，去掉第一个字符后再转 BigInt
- 影响 5 个方法: calculateProvinceTeamRight, calculateProvinceAreaRight,
  calculateCityTeamRight, calculateCityAreaRight, calculateCommunityRight

技术背景:
- accountSequence 格式: D25121400002 (用户) / S0000000001 (固定系统账户) / 9440000 (省系统)
- 省市系统账户在 authorization-service 动态创建，identity-service 中不存在
- reward-service 的 userId 字段实际业务中不被使用 (查询用 accountSequence)

潜在隐患:
1. userId 字段存储的不是 identity-service 中的真实 userId
   - D25121400002 -> 25121400002 (不是真实的自增 userId)
   - S0000000001 -> 1 (恰好匹配固定系统账户)
   - 9440000 -> 9440000 (省系统账户，本无字母前缀)
2. 如果未来 reward-service 需要与 identity-service 关联查询，可能出现问题
3. 建议后续考虑: 将 userId 改为可选字段，或完全移除该字段依赖

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

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

backend/services/reward-service/src/domain/services/reward-calculation.service.ts

@@ -66,6 +66,16 @@ const SHARE_RIGHT_POOL_USER_ID = BigInt(-5);
 export class RewardCalculationService {
   private readonly logger = new Logger(RewardCalculationService.name);
 
+  /**
+   * 将 accountSequence 转换为 userId
+   * accountSequence 格式: D25121400002 (用户) / S0000000001 (系统) / 9440000 (省系统)
+   * 如果以字母开头，去掉第一个字符后转为 BigInt
+   */
+  private parseAccountSequenceToUserId(accountSequence: string): bigint {
+    const numericPart = /^[a-zA-Z]/i.test(accountSequence) ? accountSequence.slice(1) : accountSequence;
+    return BigInt(numericPart);
+  }
+
   constructor(
     @Inject(REFERRAL_SERVICE_CLIENT)
     private readonly referralService: IReferralServiceClient,
@@ -432,7 +442,7 @@ export class RewardCalculationService {
 
       rewards.push(
         RewardLedgerEntry.createSettleable({
-          userId: BigInt(item.accountSequence),
+          userId: this.parseAccountSequenceToUserId(item.accountSequence),
           accountSequence: item.accountSequence,
           rewardSource,
           usdtAmount: itemUsdtAmount,
@@ -488,7 +498,7 @@ export class RewardCalculationService {
 
       rewards.push(
         RewardLedgerEntry.createSettleable({
-          userId: BigInt(item.accountSequence),
+          userId: this.parseAccountSequenceToUserId(item.accountSequence),
           accountSequence: item.accountSequence,
           rewardSource,
           usdtAmount: itemUsdtAmount,
@@ -544,7 +554,7 @@ export class RewardCalculationService {
 
       rewards.push(
         RewardLedgerEntry.createSettleable({
-          userId: BigInt(item.accountSequence),
+          userId: this.parseAccountSequenceToUserId(item.accountSequence),
           accountSequence: item.accountSequence,
           rewardSource,
           usdtAmount: itemUsdtAmount,
@@ -600,7 +610,7 @@ export class RewardCalculationService {
 
       rewards.push(
         RewardLedgerEntry.createSettleable({
-          userId: BigInt(item.accountSequence),
+          userId: this.parseAccountSequenceToUserId(item.accountSequence),
           accountSequence: item.accountSequence,
           rewardSource,
           usdtAmount: itemUsdtAmount,
@@ -656,7 +666,7 @@ export class RewardCalculationService {
 
       rewards.push(
         RewardLedgerEntry.createSettleable({
-          userId: BigInt(item.accountSequence),
+          userId: this.parseAccountSequenceToUserId(item.accountSequence),
           accountSequence: item.accountSequence,
           rewardSource,
           usdtAmount: itemUsdtAmount,