fix: harden DingTalk student synchronization

apps/server/src/database/database-migrations.spec.ts

@@ -49,6 +49,7 @@ function createDataSource(runner: MockRunner, dbType: string = 'better-sqlite3')
 // Type to reach private migration methods for testing
 interface MigrationsPrivate {
   ensureAiConfigTable(): Promise<void>;
+  ensureSyncStateLeaseColumns(): Promise<void>;
   backfillOrganizations(): Promise<void>;
   normalizeClassDates(): Promise<void>;
   ensureCourseAttendanceSchema(): Promise<void>;