feat(reporting-service): Implement complete reporting service with DDD architecture
- Domain layer: ReportDefinition/ReportSnapshot aggregates, value objects (DateRange, ReportPeriod, etc.)
- Application layer: CQRS commands/queries, ReportingApplicationService
- Infrastructure layer: Prisma repositories, Redis cache, export services (Excel/CSV/PDF)
- API layer: REST controllers, DTOs with validation
- Testing: Unit tests, integration tests, E2E tests, Docker test environment
- Documentation: Architecture, API, Development, Testing, Deployment, Data Model docs
- Supports scheduled report generation, multi-format export, and data caching
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Co-Authored-By: Claude <noreply@anthropic.com>
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