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/auth/blocks.go

@@ -6,4 +6,4 @@ var BlockedNamespaces = []string{
 	// Add blocked namespaces here, e.g.:
 	// "io.github.spammer",
 	// "com.evil-domain",
-}
+}