[Api Nodes]: Improve Price Badge Declarations #11582
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## Summary Backend part: Comfy-Org/ComfyUI#11582 - Move API node pricing definitions from hardcoded frontend functions to backend-defined JSONata expressions - Add `price_badge` field to node definition schema containing JSONata expression and dependency declarations - Implement async JSONata evaluation with signature-based caching for efficient reactive updates - Show one decimal in credit badges when meaningful (e.g., 1.5 credits instead of 2 credits) ## Screenshots (if applicable) <!-- Add screenshots or video recording to help explain your changes --> ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-7816-Move-price-badges-to-python-nodes-2da6d73d365081ec815ef61f7e3c65f7) by [Unito](https://www.unito.io)
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This PR extends V3 schema and allow nodes to declare price badges using JSONata syntax.
Requires support from the Frontend repo: Comfy-Org/ComfyUI_frontend#7816
API Node PR Checklist
Scope
Pricing & Billing
If Need pricing update:
QA
Comms