This commit marks the completion of phase 3.11 (UAT Ready) and includes
significant updates to deployment automation, testing, and documentation.
Key changes:
- Implement `ifnex:smoke-test` command for E2E post-deployment validation
- Implement `ifnex:preflight` command for environment audit before migration
- Implement `ifnex:import-fx-rates` for automated multi-source currency
rate imports (Exir.io and FreeCurrencyAPI)
- Update `CurrencySeeder` to support base currencies (USD, AED, EUR, CNY, IRR)
- Enhance `IfnexSmokeTest` with improved environment-aware checks and
robust HTTP mocking in tests
- Update project documentation (Roadmap, README, AGENT, Handoff) to reflect
completed phases 3.7 through 3.11
- Add UAT checklist and installation guides for recent hotfixes
- Update project statistics (models, migrations, endpoints, and test counts)
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