fix(authorization): add missing findByAccountSequence to MockTeamStatisticsRepository

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

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

@@ -46,6 +46,14 @@ const MockTeamStatisticsRepository = {
   useValue: {
     findByUserId: async () => ({
       userId: '',
+      accountSequence: BigInt(0),
+      totalTeamPlantingCount: 0,
+      getProvinceTeamCount: () => 0,
+      getCityTeamCount: () => 0,
+    }),
+    findByAccountSequence: async () => ({
+      userId: '',
+      accountSequence: BigInt(0),
       totalTeamPlantingCount: 0,
       getProvinceTeamCount: () => 0,
       getCityTeamCount: () => 0,