use node: built-in imports and remove dead smartpromise/smartdelay exports
- Replaced bare Node.js built-in imports with node: prefix in ts_server/plugins.ts, ts_client/plugins.ts, and tests (crypto, dgram) for ESM/Deno/Bun compatibility.
- Removed dead smartpromise and smartdelay exports from ts_client/plugins.ts (packages remain in package.json).
- Updated readme.hints.md to document node: import requirement, note removal of dead imports, and record the change date/notes.
- No functional API changes expected — this is a compatibility/cleanup patch.
Implement full RADIUS server and client with RFC 2865/2866 compliance, including packet handling, authenticators, attributes, secrets manager, client APIs, and comprehensive tests and documentation
- Add ts_shared module with protocol enums and core interfaces (RFC 2865/2866)
- Add ts_server module: RadiusServer implementation, RadiusPacket encoder/decoder, RadiusAttributes, RadiusAuthenticator, RadiusSecrets and server README