Add issue change history and daily issue stats

Issue changes are recorded per field in the issue_change table, in the same
transaction as the issue itself. The new history module exposes:
- GET /api/issues/:issueId/history — change timeline grouped by save
- GET /api/issues/stats/daily — created, status transitions and status
  snapshot per day, with time zone support

The migration backfills history for existing issues. Setting a field to its
current value no longer bumps updatedAt or emits issue.updated.

src/modules/history/history.module.ts

@@ -0,0 +1,30 @@
+import { Module } from '@nestjs/common';
+import { PrismaModule } from '../../common/prisma-adapter/prisma.module.js';
+import { IssueModule } from '../issue/issue.module.js';
+import { UserModule } from '../user/user.module.js';
+import { ISSUE_HISTORY_REPOSITORY } from './domain/repositories/issue-history.repository.interface.js';
+import { IssueHistoryPrismaRepository } from './infrastructure/persistence/prisma/repositories/issue-history.prisma-repository.js';
+import { HistoryController } from './presentation/controllers/history.controller.js';
+import { GetIssueHistoryUseCase } from './application/use-cases/get-issue-history/get-issue-history.use-case.js';
+import { GetDailyIssueStatsUseCase } from './application/use-cases/get-daily-issue-stats/get-daily-issue-stats.use-case.js';
+
+/**
+ * Чтение истории изменений задач и статистика по ней. Пишет историю
+ * issue-модуль (IssuePrismaRepository) — в одной транзакции с задачей;
+ * этот модуль от issue зависит, issue о нём не знает.
+ */
+@Module({
+  imports: [PrismaModule, IssueModule, UserModule],
+  controllers: [HistoryController],
+  providers: [
+    GetIssueHistoryUseCase,
+    GetDailyIssueStatsUseCase,
+    {
+      // Domain видит только интерфейс IIssueHistoryRepository,
+      // конкретную реализацию (Prisma) подставляет DI-контейнер здесь
+      provide: ISSUE_HISTORY_REPOSITORY,
+      useClass: IssueHistoryPrismaRepository,
+    },
+  ],
+})
+export class HistoryModule {}