[Reports] Add recent activity receipt search endpoint #563

Related work

This issue supports the mobile report work tracked in TransactionProcessorACL issue #708.

Goal

Expose a reporting endpoint for recent activity receipts that supports the mobile app's search screen.

Requirements

• Accept a single report date only. Do not allow a multi-day range.
• Support pagination with page number and page size.
• Support optional free-text search.
• Return results sorted by transaction date/time descending.
• Return only the fields needed by the mobile UI:
  • reference
  • transaction type
  • product
  • operator
  • status
  • amount
  • transaction date/time
  • receipt reference
• Return paging metadata so the client can render previous/next state.

Suggested request DTO

• ReportDate
• SearchText?
• PageNumber
• PageSize

Suggested response DTO

• ReportDate
• PageNumber
• PageSize
• TotalCount
• Items[]

Acceptance criteria

• A request for a given date returns only transactions on that date.
• Search is applied before paging.
• Results are ordered descending by transaction date/time.
• The response is suitable for the mobile activity report screen without extra client-side reshaping.

Notes

• Receipt resend is tracked separately in a different issue.