KIE Kling 3.0 Preflight

Validate Kling 3.0 inputs and build the exact payload JSON without submitting a generation task.

Status: Experimental support node for Kling 3.0 development.

Purpose

Catch wiring and formatting errors before expensive generation.
Preview exactly what would be sent to:
- POST https://api.kie.ai/api/v1/jobs/createTask

kling_data (KIE_KLING3_REQUEST): validated payload object for direct chaining into KIE Kling 3.0 (Video).
payload_json (STRING): exact request payload after validation and upload URL resolution.
notes (STRING): validation summary with detected settings and status.

This node still uploads required input media to produce valid URLs in payload.
In multi-shot mode, duration is auto-calculated from shot durations.
In multi-shot mode, payload sound is enforced to true for current endpoint compatibility.
Multi-shot shots_text must use: shot_label | duration | prompt (duration supports 4 or 4 seconds).
notes returns a VALID summary when checks pass, including:
- mode, single/multi-shot status, resolved duration
- frame count and aspect-ratio handling
- element count and names
- shot count (multi-shot) or sound status (single-shot)