fix: remove deprecated gemini-2.5-flash-image-preview from model enum

[huntcsg]

Problem

Google removed the gemini-2.5-flash-image-preview model from Vertex AI, causing 404 errors for users selecting it.

Fix

Remove the deprecated gemini_2_5_flash_image_preview enum value from GeminiImageModel, so new users only see the GA model gemini-2.5-flash-image.

Related

• comfy-api PR adds a proxy sanitization rule so existing workflows/cached UIs still work

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]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 2d4970f and 081a377.

📒 Files selected for processing (1)

• comfy_api_nodes/nodes_gemini.py

💤 Files with no reviewable changes (1)

• comfy_api_nodes/nodes_gemini.py

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📝 Walkthrough

Walkthrough

This pull request removes the gemini_2_5_flash_image_preview enum member from the GeminiImageModel enumeration in the nodes_gemini.py file. The removed member had the string value "gemini-2.5-flash-image-preview". With this change, this model option is no longer available as a selectable choice in the model input dropdown for the GeminiImage node within any UI or schema that references this enumeration.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: removing a deprecated Gemini model from the enum.
Description check	✅ Passed	The description is directly related to the changeset, explaining the problem, fix, and relevant context about the deprecated model removal.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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