- Renamed pkg/service/crypto to pkg/service/certmanager
- Updated package declaration from 'crypto' to 'certmanager'
- Fixed all import statements across the codebase
- Updated type references from *crypto.CertificateManager to *certmanager.CertificateManager
- Renamed files for consistency: crypto.go -> certmanager.go, crypto_test.go -> certmanager_test.go
- Resolves golangci-lint var-naming issue about conflicting with Go standard library package names
- All tests pass and linter reports 0 issues