Fix stats query params: sending_streams[] and add --esps filter

[solovey23]

Summary

• Fix stats get: wrong query param streams[] → sending_streams[] — the filter was being silently ignored by the API, so --streams transactional returned unfiltered results identical to no filter at all
• Add missing --esps flag (email_service_providers[]) to all 5 stats commands: get, by-domain, by-category, by-esp, by-date
• Improve --streams flag description to clarify valid values (transactional, bulk)

Test plan

• mailtrap stats get --start-date 2026-03-07 --end-date 2026-04-07 --streams transactional returns different results than without --streams
• mailtrap stats get --start-date 2026-03-07 --end-date 2026-04-07 --esps Google filters by ESP correctly
• Same filters work on by-domain, by-category, by-esp, by-date

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 18007ba5-4c40-4fb4-8af0-ab38f23e9321

📥 Commits

Reviewing files that changed from the base of the PR and between aced56e and eddab9a.

📒 Files selected for processing (5)

• internal/commands/stats/by_category.go
• internal/commands/stats/by_date.go
• internal/commands/stats/by_domain.go
• internal/commands/stats/by_esp.go
• internal/commands/stats/get.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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