Implement Vercel Project Domain Alias Lifecycle Management with DNS Automation

[temma02]

Description

Implement full lifecycle management for Vercel project domain aliases, automating DNS record creation, verification, and cleanup as custom domains are added and removed.

Requirements and Context

• Correctness: DNS records must be created and cleaned up reliably
• Testing: Test domain add, verify, and remove flows
• Documentation: Document the domain lifecycle

Suggested Execution

Branch: feat/issue-116-vercel-domain-alias-lifecycle

Implement Changes

• Automate DNS record creation when a custom domain is added
• Verify DNS propagation before activating the domain
• Clean up DNS records and aliases when a domain is removed
• Handle partial-failure states in the domain lifecycle

Test and Commit

• Test domain add, verify, and remove flows
• Test cleanup on domain removal
• Document the domain lifecycle

Example Commit Message

feat(vercel): implement domain alias lifecycle management with DNS automation

- Automate DNS record creation on domain add
- Verify DNS propagation before activation
- Clean up DNS records and aliases on removal

Guidelines

• Verify DNS propagation before activating domains
• Clean up orphaned DNS records on removal
• Handle partial-failure states gracefully