fix(authorization-service): register SystemAccountApplicationService in AppModule

Add missing dependency injection for SystemAccountApplicationService
which is required by InternalAuthorizationController for system account
report statistics API.

- Import SystemAccountRepositoryImpl and SYSTEM_ACCOUNT_REPOSITORY
- Register SystemAccountApplicationService as provider
- Register SYSTEM_ACCOUNT_REPOSITORY with SystemAccountRepositoryImpl

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

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

backend/services/authorization-service/src/app.module.ts

@@ -17,13 +17,24 @@ import {
   MonthlyAssessmentRepositoryImpl,
   MONTHLY_ASSESSMENT_REPOSITORY,
 } from '@/infrastructure/persistence/repositories/monthly-assessment.repository.impl'
+// [2026-01-04] 新增：系统账户仓储，用于系统账户报表统计
+// 回滚方式：删除此 import 及下方 providers 中的 SYSTEM_ACCOUNT_REPOSITORY 和 SystemAccountApplicationService
+import {
+  SystemAccountRepositoryImpl,
+  SYSTEM_ACCOUNT_REPOSITORY,
+} from '@/infrastructure/persistence/repositories/system-account.repository.impl'
 import { RedisModule } from '@/infrastructure/redis/redis.module'
 import { KafkaModule } from '@/infrastructure/kafka/kafka.module'
 import { EventConsumerController } from '@/infrastructure/kafka/event-consumer.controller'
 import { ReferralServiceClient, IdentityServiceClient, RewardServiceClient } from '@/infrastructure/external'
 
 // Application
-import { AuthorizationApplicationService, REFERRAL_REPOSITORY, TEAM_STATISTICS_REPOSITORY } from '@/application/services'
+import {
+  AuthorizationApplicationService,
+  SystemAccountApplicationService,
+  REFERRAL_REPOSITORY,
+  TEAM_STATISTICS_REPOSITORY,
+} from '@/application/services'
 import { MonthlyAssessmentScheduler } from '@/application/schedulers'
 
 // API
@@ -84,6 +95,11 @@ const MockReferralRepository = {
       provide: MONTHLY_ASSESSMENT_REPOSITORY,
       useClass: MonthlyAssessmentRepositoryImpl,
     },
+    // [2026-01-04] 新增：系统账户仓储
+    {
+      provide: SYSTEM_ACCOUNT_REPOSITORY,
+      useClass: SystemAccountRepositoryImpl,
+    },
     MockReferralRepository,
 
     // External Service Clients (replaces mock)
@@ -97,6 +113,8 @@ const MockReferralRepository = {
 
     // Application Services
     AuthorizationApplicationService,
+    // [2026-01-04] 新增：系统账户应用服务，用于系统账户报表统计
+    SystemAccountApplicationService,
     MonthlyAssessmentScheduler,
 
     // Strategies