docs: restore Grok partner-nodes nav group in docs.json

[lin-bot23]

The Grok Imagine Video 1.5 tutorial page files exist in all four languages, but the nav group was accidentally dropped from docs.json by the weekly sync (PR #1229; leftover corrupt entry removed in #1325). The template api_grok_imagine_video_1_5 is still listed in workflow_templates index.json and the page is still valid.

Restore the Grok group after Topaz in the Partner Nodes section for en/zh/ja/ko.

@lin-bot23 please review and merge.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: a5afedd2-db57-4883-9208-c286ad199dea

📥 Commits

Reviewing files that changed from the base of the PR and between 5459b6f and d29dfda.

📒 Files selected for processing (1)

• docs.json

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📝 Walkthrough

Walkthrough

Added the grok-imagine-video-1-5 partner-node page to English, Chinese, Japanese, and Korean navigation sections.

Changes

Grok navigation

Layer / File(s)	Summary
Localized partner-node navigation docs.json	Added the Grok partner-node group and grok-imagine-video-1-5 page to English, Chinese, Japanese, and Korean navigation sections.

Suggested reviewers: comfyui-wiki, robinjhuang

Merge Risk: ⚪ Minimal · up to d29df

This restores an existing documentation navigation group across the supported languages without changing runtime behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
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.

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