Upgrade to Python 3.13 and Django 6

[delitamakanda]

Summary

• bump the stack to Python 3.13/Django 6 and refresh dependency versions to match
• modernize project settings for Django 6 (pathlib paths, timezone handling, whitenoise storage, updated CORS configuration)
• update URL routing to modern path/re_path usage and refresh documentation for the new runtime

Testing

• Not run (environment not yet configured for Python 3.13/Django 6 dependencies)

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Replace removed STATICFILES_STORAGE in Django 6

The settings now declare STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage', but requirements pin the project to Django >=6.0a1. Django 6 removes the legacy STATICFILES_STORAGE/DEFAULT_FILE_STORAGE settings in favor of the STORAGES mapping, so keeping this line causes startup/staticfiles initialization to fail and prevents WhiteNoise from being used. Configure the STORAGES['staticfiles'] backend instead to keep the app running on the new Django version.

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