fix(sitemap): use repository updates for repositories lastmod

[Utkarsh3725]

What

Fixes the /repositories static sitemap entry so its lastmod is based on the latest Repository.updated_at value.

Why

Closes #5259.

Previously /repositories was missing from the static sitemap model mapping, so it fell back to datetime.now(UTC) on every sitemap generation.

Testing

• Added regression coverage for /repositories.
• Ran python3 -m py_compile backend/src/apps/sitemap/views/static.py backend/tests/unit/apps/sitemap/views/static_test.py
• Ran git diff --check

Could not run the focused pytest locally because Poetry is not installed in the environment.

[github-actions]

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  • ad43940

[coderabbitai]

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Review failed

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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 61d1a37 and ad43940.

📒 Files selected for processing (2)

• backend/src/apps/sitemap/views/static.py
• backend/tests/unit/apps/sitemap/views/static_test.py

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Summary by CodeRabbit

• Bug Fixes
  • Sitemap timestamps for the repositories page now reflect the latest repository update instead of the current time.
• Tests
  • Added coverage to verify the repositories sitemap timestamp behavior.

Walkthrough

The static sitemap now derives /repositories lastmod from the latest Repository.updated_at value. A unit test verifies the repository aggregation and returned timestamp.

Changes

Repository sitemap timestamp

Layer / File(s)	Summary
Map and validate repository lastmod backend/src/apps/sitemap/views/static.py, backend/tests/unit/apps/sitemap/views/static_test.py	The /repositories route maps to Repository. The test verifies the aggregated latest timestamp is returned.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Low

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud