feat: add notification delivery history endpoint

[Hassanmovic98]

Description

Implement notification delivery history endpoint for issue #27.

Changes

• Added NotificationHistoryService with cursor pagination and filtering
• Implemented GET /api/notifications/history endpoint
• Supports status filtering (SUCCESS, FAILED, RETRY) and date range filtering
• Enforces maximum limit of 100 records per request
• Added comprehensive test suite (5 tests, all passing)

Tests

• Basic retrieval with correct structure
• Pagination boundaries (limit/offset)
• Status filtering
• Maximum limit enforcement
• Database error handling

Acceptance Criteria Met

• Notification history can be queried via GET /api/notifications/history
• Results are paginated with limit/offset
• Delivery status visible for every record

Closes #27

[Abd-Standard]

please resolve conflicts