Capture the Comfy-Usage-Source header (or extra_data.comfy_usage_source)
on POST /prompt and forward it on API nodes' outbound requests to
api.comfy.org, defaulting to comfyui-server when absent.
* chore(api-nodes): applied ruff's pyupgrade(python3.10) to api-nodes client's to folder
* chore(api-nodes): add validate_video_frame_count function from LTX PR
* chore(api-nodes): replace deprecated V1 imports
* fix(api-nodes): the types returned by the "poll_op" function are now correct.
* feat(api-nodes): implement new API client for V3 nodes
* feat(api-nodes): implement new API client for V3 nodes
* feat(api-nodes): implement new API client for V3 nodes
* converted WAN nodes to use new client; polishing
* fix(auth): do not leak authentification for the absolute urls
* convert BFL API nodes to use new API client; remove deprecated BFL nodes
* converted Google Veo nodes
* fix(Veo3.1 model): take into account "generate_audio" parameter