[API Nodes]: fixes and refactor

[bigcat88]

1. Applied ruff check comfy_api_nodes --fix while temporarily setting the minimum Python version to 3.10 and adding the UP rule.

2. Added validate_video_frame_count function from this PR

3. Removed imports of V1 files, and replaced them by correct import from V3 schema.

4. Additionally, finally, fixed the poll_op return typing:

   Updated poll_op extractor type hints from Callable[[M], ...] to Callable[[M | Any], ...]

   • Problem: IDEs (like PyCharm) or type-checkers were getting stuck in a circular inference loop between the response_model and the lambda arguments, causing the final return type of poll_op to be lost.
   • Solution: Adding Any creates a permissive union that allows the IDE/type-checkers to resolve M solely from response_model, restoring strict typing for the function result.
   • Alternative Considered: Idea of using Callable[..., ...] (Ellipsis) was rejected because, while it fixes the inference issue, it loses argument count validation and hides the API intent that the callback receives type M.

API Node PR Checklist

Scope

• Is API Node Change (no)

Pricing & Billing

• Need pricing update
• No pricing update

If Need pricing update:

• Metronome rate cards updated
• Auto‑billing tests updated and passing

QA

• QA done
• QA not required

Comms

• Informed Kosinkadink

[bigcat88]

+label: Core

[Kosinkadink]

tested locally on nano banano pro and wan 2.5 txt2video nodes, all seems to work. merging