test(inspect): add tests for services.go, kvm.go, hetzner.go, output.go

[CodeMonkeyCybersecurity]

Context

pkg/inspect/ has 0% test coverage for:

• services.go (689 lines) - systemd, nginx, apache, postgresql, mysql, redis, hashicorp, tailscale discovery
• kvm.go - KVM/libvirt VM discovery
• hetzner.go - Hetzner Cloud API discovery
• output.go (1072 lines) - YAML and Terraform generation
• terraform_modular.go - modular Terraform generation

Problem

• Zero regression protection for parsing logic
• extractVersion() regex patterns untested
• Terraform generation (sanitizeTerraformName, generateDockerTerraform, etc.) has no tests
• YAML serialization untested

Proposal

Extract pure parsing functions (like docker.go refactor) and add tests:

1. extractVersion() - test with various version string formats
2. sanitizeTerraformName() - test edge cases (numbers, special chars, empty)
3. parseMemoryInfo(), parseCPUInfo(), parseDiskInfo() - test with sample command output
4. generateDockerTerraform() - test Terraform HCL generation
5. WriteYAML() - test serialization with known input

Target: 70%+ coverage on parsers, 50%+ overall package coverage.