Add Orukeet as an optional local transcription model

Add Orukeet as an optional local model in Meetily's existing Parakeet engine. Keep Lightning/v3 as the default.

I have a combined INT8 ONNX export running in Meetily's current Rust inference core with token timestamps. On 30 fixed FLEURS clips across six languages (two passes per model, Linux CPU), warm median inference was 195 ms versus 262 ms for the shipped Parakeet v3 files. WER was 9.70% versus 10.02%; this small sample does not establish a general accuracy improvement.

The integration would use pinned model files, include the CC BY-SA 4.0 weight license and conversion credits, and expose Orukeet in the existing download/model picker. No hosted API or account is required.