fix(transactions): cap analytics date range to 365 days and reject ov…

[dekaptain2]

Pull Request: Cap Transaction Analytics Date Range

Summary

• Add a hard limit to transaction analytics date queries in TransactionsService.getAnalytics
• Reject requests where endDate - startDate > 365 days with a 400 Bad Request
• Document the 365-day maximum window in TransactionAnalyticsQueryDto
• Add a regression test for oversized date ranges

Files changed

• src/transactions/transactions.service.ts
• src/transactions/dto/transaction.dto.ts
• src/transactions/transactions.service.spec.ts

Notes

• This prevents long-running, unbounded Postgres analytics queries from pinning connections.

Closes #684

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