refactor: enhance database migrations and harden test suites (#342 #343 #344 #345)

[Dannyswiss1]

Summary

This PR implements enhancements across database migrations and test suites to improve robustness, error handling, and resilience under heavy load.

Changes Implemented

Migration Enhancements (#342, #343)

• Fixed malformed migration file containing duplicate/broken SQL statements
• Removed duplicate enum creation, table definitions, and redundant indexes
• Preserved transaction-based safety guarantees and idempotent table creation logic
• Enhanced logging for migration lifecycle events

JWT Validation Test Hardening (#344)

• Added beforeEach hooks for test isolation and mock cleanup
• Wrapped critical test cases in try-catch blocks with descriptive error messages
• Fixed missing isKycVerified property in InMemoryUser test mock
• Improved async error reporting for better test failure diagnostics

Settlement Integration Test Hardening (#345)

• Added beforeEach/afterEach lifecycle hooks for proper test isolation
• Wrapped settlement flow tests in try-catch blocks with error context
• Enhanced error handling across rejection, pro-rata distribution, and edge cases
• Ensured consistent test cleanup and mock restoration

Supporting Fixes

• Fixed User.model.ts toPublicDTO return type mismatch
• Removed unused imports from Invoice.model.ts and auth.service.ts
• Fixed malformed code in invoice.service.ts
• Fixed class closing braces in model files

Impact

✅ Improved migration robustness and error handling
✅ Enhanced test reliability and failure diagnostics
✅ Reduced cascading failures in downstream systems
✅ Better error context for debugging
✅ Backward compatible - no breaking changes

Closes #342
Closes #343
Closes #344
Closes #345

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