[REQ-006] Custom Domain Support via CNAME

[pv-dsgn]

Requirement

REQ-006: Developer can set custom domain via CNAME

Acceptance Criteria

• Developer enters custom domain in dashboard settings
• DNS CNAME validation implemented
• SSL certificate auto-provisioned (Let's Encrypt)
• DNS propagation reflected within 24 hours
• Fallback to hehhi.me subdomain if custom domain unavailable
• Clear error messaging for DNS configuration issues

Technical Details

• CNAME record validation logic
• Automated SSL certificate provisioning
• DNS polling for propagation verification
• Subdomain-to-custom-domain routing
• Redirect handling (www, root domain)

Infrastructure

• SSL/TLS certificate management
• DNS validation infrastructure
• Domain verification logging