Six defects in the RunwayML video provider:
- transform_video_create_request hardcoded /image_to_video, so text-to-video 400'd and video-to-video was unreachable; the endpoint is now selected from the inputs present (promptVideo/videoUri, promptImage, or text only)
- get_error_class raised instead of returning, turning a provider 4xx into a proxy 500 APIConnectionError; it now returns a RunwayMLError
- VideoObject.progress was typed int while Runway sends a 0..1 float, 500'ing status polls while RUNNING; it is now scaled to a 0..100 percent
- custom per-deployment pricing stored under litellm_metadata was ignored for video; the deployment model_info lookup now checks both metadata keys
- stale cost-map entries (gen3a_turbo, gen4_aleph) were removed and current models added, with output_cost_per_second_480p/_4k tier keys plumbed through the model-info and router types
- video cost now falls back to Runway's estimatedCost from the create response when no custom pricing is configured, and custom pricing always wins over it
Fixes#36483
