Summary

• add Spec Kit artifacts for GitHub issue Basic title search #16 (spec, plan, tasks, and issue context input)
• add API test coverage for combined query + page + pageSize metadata behavior
• add repository test coverage for OriginalTitle matching and case-insensitive search

Validation

• dotnet test backend/tests/SmartMovieCatalog.Api.Tests/SmartMovieCatalog.Api.Tests.csproj --filter "FullyQualifiedName~ListMoviesEndpointTests"
• dotnet test backend/tests/SmartMovieCatalog.Infrastructure.Tests/SmartMovieCatalog.Infrastructure.Tests.csproj --filter "FullyQualifiedName~EfMovieRepositoryTests"
• npm test -- --watch=false (frontend)
• npm run build (frontend)

Notes

• left unrelated local changes in specs/017-home-movie-cards/* out of this PR scope