chore: nuke post-migration dead code, deps, and broken Dockerfile fallback

- Drop ``wait_for_http_ready`` (FastAPI sidecar healthcheck) — only Caido
  TCP probe survives now. Removes the ``httpx`` import.
- Delete ``ListSitemapRenderer`` / ``ViewSitemapEntryRenderer`` — render
  UI for tools that disappeared with the Caido SDK migration.
- Drop ``scrubadub`` runtime dep — PII sanitizer was nuked previously
  but the dep stayed; resolve strips 18 transitives (numpy, scipy,
  scikit-learn, nltk, faker, …).
- Drop empty ``[project.optional-dependencies] sandbox`` section — last
  in-container Python dep migrated out.
- Drop unused mypy overrides (``pydantic_settings``, ``jwt``, ``gql``,
  ``scrubadub``, ``httpx``) and the stale ``fastapi`` isort group.
- Collapse Dockerfile's ``pipx install -r ... 2>/dev/null || venv``
  fallback into a direct venv install — pipx never accepted ``-r`` so
  the fallback was always firing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

containers/Dockerfile

@@ -198,8 +198,7 @@ ENV SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
 RUN mkdir -p /workspace && chown -R pentester:pentester /workspace /app
 
 USER pentester
-RUN pipx install --include-deps -r /home/pentester/tools/jwt_tool/requirements.txt 2>/dev/null || \
-    python3 -m venv /app/.venv && \
+RUN python3 -m venv /app/.venv && \
     /app/.venv/bin/pip install --no-cache-dir -r /home/pentester/tools/jwt_tool/requirements.txt && \
     ln -s /home/pentester/tools/jwt_tool/jwt_tool.py /home/pentester/.local/bin/jwt_tool