fix(seo): add recommended licensing fields to ImageObject JSON-LD

[MarkusNeusinger]

Fixes the 4 Image Metadata structured data issues Search Console reported for anyplot.ai (missing creator, copyrightNotice, creditText, acquireLicensePage).

Summary

• The flagged markup is the ImageObject inside the SoftwareSourceCode JSON-LD that api/routers/seo.py renders on every bot-facing implementation page (the only ImageObject the site emits — the four Search Console issues map one-to-one to its four missing recommended fields).
• The node now carries all four beside the existing license: creator (the same anyplot Organization node the graph already uses for author), creditText (anyplot.ai), copyrightNotice (© anyplot.ai — MIT License), and acquireLicensePage pointing to https://anyplot.ai/legal, the page that states the MIT terms the renders are offered under.
• Added a regression test asserting the licensing fields on the JSON-LD image node.

Test plan

• /verify-core gates on the touched files: pytest tests/unit/api/test_seo_helpers.py (62 passed, including the new test_jsonld_image_carries_licensing_metadata), ruff check, ruff format --check, mypy api/routers/seo.py — all clean.
• After deploy: validate an implementation page (e.g. /scatter-basic/python/matplotlib) with Google's Rich Results Test as a bot user agent, then use "Validate fix" in Search Console.

Checklist

• CHANGELOG.md updated under [Unreleased] → ### Fixed
• Related documentation updated — n/a: no documented behavior, event, or workflow changes.

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Generated by Claude Code

[Copilot]

🟢 Approval recommended

The JSON-LD changes are narrowly scoped, consistent with existing structured-data patterns in the file, and covered by a focused regression test plus a changelog entry.

Pull request overview

This PR updates the bot-facing JSON-LD emitted by api/routers/seo.py so the ImageObject inside the SoftwareSourceCode graph includes the four Google-recommended image licensing/attribution fields (creator, copyrightNotice, creditText, acquireLicensePage) that Search Console flagged as missing across implementation pages.

Changes:

• Add the four recommended licensing fields to the ImageObject JSON-LD for implementation renders (alongside the existing license).
• Add a unit regression test asserting the new licensing fields are present on the JSON-LD image node.
• Add a [Unreleased] changelog entry documenting the structured data fix.

File summaries

File	Description
api/routers/seo.py	Enriches the ImageObject JSON-LD for implementation-page renders with recommended licensing/credit metadata.
tests/unit/api/test_seo_helpers.py	Adds a regression test ensuring the ImageObject carries the new licensing fields.
CHANGELOG.md	Documents the fix under [Unreleased] -> Fixed following existing changelog conventions.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Lite

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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