feat(api-nodes): enable Kling 3.0 Motion Control

[bigcat88]

API Node PR Checklist

Scope

• Is API Node Change

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

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds model selection capability to the Kling Motion Control node. A new optional input field is introduced that allows selection between "kling-v3" and "kling-v2-6" models. The execute method signature is updated to accept this model parameter with "kling-v2-6" as the default value. The selected model is then passed to the MotionControlRequest API call via the model_name parameter.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately describes the main change: enabling Kling 3.0 Motion Control by adding model selection support.
Description check	✅ Passed	The pull request description provides a structured API Node PR checklist that aligns with the changeset's objective to enable Kling 3.0 Motion Control with pricing and QA considerations.

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