[FEATURE] display the **Hit Rate** in the statistics view

[dan-connor]

Currently, TinyRDM shows basic Redis statistics like memory usage, key count, and uptime.
It would be helpful to also display the Hit Rate (hits / (hits + misses)) in the statistics view.

Use case:
The Hit Rate is a useful metric for evaluating cache efficiency. Including it directly in the UI would make it easier to monitor Redis performance without switching to the CLI.

Thanks for your great work on this tool!

[tiny-craft]

I am working for the rewrite version, I will consider adding a custom data module display for the status page in this version~