Add test coverage and improve localization

[TrickShotMLG02]

🚀 Summary

This PR promotes the current development branch to master. It includes localization fixes, upload security hardening, importer hardening, test coverage improvements, and several release-readiness fixes.

🧩 Related Issues

N/A

🔍 What Changed?

• Improved localization:

  • Added missing translations for recipe importer URL fields
  • Added i18n support for admin templates
  • Updated German translations, including model verbose names
  • Preserved German characters like ä, ö, ü, and ß in non-URL text
  • Normalized slugs to URL-safe ASCII form

• Hardened recipe image handling:

  • Stripped metadata from uploaded recipe images to avoid leaking EXIF/location data
  • Added a management command to clean metadata from existing uploads
  • Rejected animated image uploads

• Hardened recipe importers:

  • Added stricter image content-type handling
  • Avoided unsafe importer URL/domain handling
  • Improved importer registration behavior

• Improved security/configuration:

  • Made missing SECRET_KEY fail loudly instead of silently generating a random key
  • Clarified .env setup expectations
  • Preserved existing staff permissions while keeping newly OIDC-created users non-staff by default

• Fixed project readiness issues:

  • Fixed unit type choice handling
  • Fixed admin importer route ordering
  • Removed duplicate ingredient slug field
  • Made tag seeding non-destructive
  • Reconciled migration state
  • Ignored JetBrains module metadata

• Improved nutrition/import behavior:

  • Added saturated fat and sugar tracking
  • Fixed OpenFoodFacts sugar imports

• Improved testing and coverage:

  • Added custom test coverage tooling
  • Added progress output and test summaries
  • Expanded tests with edge cases and regression coverage
  • Added GitHub Actions coverage workflow
  • Added branch-aware coverage badges to the README
  • Required authenticated Codecov uploads

• Other cleanup:

  • Removed recipe publishing status from the recipe detail view

🧪 How to Test

# Run the full test suite
uv run python manage.py test

# Run without progress output if needed
uv run python manage.py test --no-progress

# Run the project coverage command
uv run python manage.py test_coverage

# Run coverage with the standard coverage.py report
uv run coverage run manage.py test --no-progress --no-color
uv run coverage report

Manual checks worth doing before merge:

• Import recipes through the available recipe importers.
• Upload recipe images and verify they still display correctly.
• Try uploading an animated image and verify it is rejected.
• Check German UI labels for importer fields and admin pages.
• Confirm staff/superuser permissions behave as expected for existing users.

✅ Checklist

• Tests pass locally
• Coverage tooling is available locally and in CI
• Security-related upload handling was added
• Localization files were updated
• README/testing documentation was updated
• Release-readiness fixes were included

📎 Additional Notes

This PR includes the accumulated development changes since the last master release and is intended as the next development-to-master promotion.

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