[Partner Nodes] feat: add Krea2 Image nodes

[bigcat88]

New node for the Medium and Large endpoints: https://docs.krea.ai/api-reference/image/krea-2-medium

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 PR adds a new Krea 2 image-generation module for ComfyAPI. The changes introduce two nodes: Krea2ImageNode for submitting prompts and polling generation results, and Krea2StyleReferenceNode for building chains of style references with automatic image upload to Krea's asset storage. The module includes shared constants, a multipart image upload helper, dynamic model configuration, moodboard validation, optional style-reference composition with a maximum chain length of 10, and extension registration via comfy_entrypoint().

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding Krea2 Image nodes as partner nodes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description clearly relates to the changeset, referencing the Krea-2 Image API nodes being added and including necessary checklists for API node PRs.

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@comfy_api_nodes/nodes_krea.py`:
- Line 175: The prompt is currently validated with validate_string(prompt,
strip_whitespace=False, min_length=1) which accepts whitespace-only input;
update the logic to reject such prompts by trimming before validation or
enabling stripping—e.g., call prompt = prompt.strip() before validation or
change to validate_string(prompt, strip_whitespace=True, min_length=1)—so that
whitespace-only prompts are rejected before sending to Krea and downstream API
errors are avoided.
- Around line 190-197: The code assumes each entry in style_reference has "url"
and "strength" and will crash on malformed items; update the builder in
nodes_krea.py (the block that constructs image_style_references and uses
KreaImageStyleReference) to validate each item shape and types before creating
KreaImageStyleReference: ensure each item is a dict, contains "url" and
"strength", "url" is a non-empty string and "strength" can be converted to
float, and if any item fails validation raise a clear ValueError describing the
invalid item index and reason (and keep the existing max-10 check).

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4f54f56b-0ca7-49e9-954d-c126b8d67a23

📥 Commits

Reviewing files that changed from the base of the PR and between 2072d3e and da18688.

⛔ Files ignored due to path filters (1)

• comfy_api_nodes/apis/krea.py is excluded by !comfy_api_nodes/apis/**

📒 Files selected for processing (1)

• comfy_api_nodes/nodes_krea.py