refactor: replace commented tests with proper integration tests

[LaGodxy]

## Task Completed Successfully ✅

I have successfully implemented the ClaimsService test refactoring according to the requirements:

What Was Accomplished:

1. Branch Created: refactor/claims-service-tests

2. Test Structure Refactored:

   • Removed 649 lines of commented-out provider-specific tests
   • Added 16 comprehensive integration tests (324 lines)
   • Focused purely on service delegation and integration concerns

3. Integration Test Coverage:

   • ClaimLookupProvider delegation (4 tests)
   • TokenVerificationProvider delegation (4 tests)
   • ClaimRedemptionProvider delegation (4 tests)
   • Combined operations (2 tests)
   • Service instantiation (2 tests)

4. Key Test Features:

   • Proper delegation verification to each provider
   • Correct parameter passing validation
   • Unmodified response returns (toBe() and toEqual() checks)
   • Error propagation validation
   • Comprehensive inline documentation

Results:

• ✅ All 54 tests pass (16 integration + 38 provider unit tests)
• ✅ Lint checks pass
• ✅ Build succeeds
• ✅ Only integration tests remain in claims.service.spec.ts
• ✅ Provider logic properly separated into dedicated test files

Files Modified:

• src/modules/claims/claims.service.spec.ts - Complete rewrite with integration tests

The refactoring successfully addresses all acceptance criteria and maintains the integrity of the codebase while providing comprehensive test coverage for the ClaimsService's delegation functionality.

closes #43