fix(tests): fix paperless-ngx container-structure-test config

[Copilot]

The tests/paperless-ngx.yaml referenced a non-existent binary (/app/bin/paperless-ng) and had a TBD placeholder checksum, causing all four tests to fail.

Changes

• Removed commandTests — the sha256sum test had an unfilled TBD expected output; it would always fail
• Replaced paperless-ng binary exists (path: /app/bin/paperless-ng) with manage.py exists (path: /app/manage.py) — the actual Django management entry point copied from src/manage.py during the build; no bin/ subdir exists in paperless-ngx src/, and pyproject.toml sets package = false so no pip entry-point scripts are installed either
• Kept the two nltk data existence tests unchanged — they remain valid

[Copilot]

Pull request overview

This PR fixes the paperless-ngx container-structure-test configuration so CI stops failing due to checks against a non-existent binary path and an unfilled checksum placeholder.

Changes:

• Replace the file existence check from /app/bin/paperless-ng to /app/manage.py.
• Remove the commandTests section that contained a TBD sha256 expected output (guaranteed failure).
• Keep the existing NLTK data existence checks as-is.

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