- Add the `const.go` file defining `ENV` type and constants `EnvStaging` and `EnvProd`
- Update `go.mod` to use `go 1.20` instead of `go 1.17`
- Introduce `model.go` file for ViettelFFM partner API structs
- Implement client methods for creating outbound requests and updating logistics information
- Implement an authentication method for the client with `AuthRes` struct
- Define constants for base URLs and authentication paths in ViettelFFM client
- Implement helper methods for getting base URL and making HTTP requests via NATS
- Update `util/httputil/const.go` to include `HeaderKeyAuthorization` constant
Signed-off-by: Sinh <luuvansinh555@gmail.com>