bend ports

when a device has ports that are not straight, such as in a ring resonator directional coupler, we should be using ports that are angled rather than straight.  Otherwise it adds mode-mismatch losses.  

<img width="240" alt="Image" src="https://github.com/user-attachments/assets/867aa647-1adc-4e32-a5bb-5fb5b04d9a5f" />