docs: clarify release deployment process and enable manual deploy trigger

- Add workflow_dispatch to deploy.yml for manual deployment triggers
- Document that releases don't auto-deploy to production
- Add instructions for deploying releases to production
- Add verification steps for deployment

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/validators/validators.go

@@ -505,4 +505,4 @@ func isValidHostForDomain(hostname, publisherDomain string) bool {
 	}
 
 	return false
-}
+}