fix(images): vendor spacy zh model + nltk data for air-gapped GitHub builds

- runtime: install zh_core_web_sm from vendored wheel (reused from runtime-ray)
  instead of 'python -m spacy download' (GitHub 403 on server)
- runtime / runtime-ray / backend-python: replace nltk.download (GitHub +
  nltk_data.nltk.org unreachable from server) with vendored zips extracted
  to /usr/local/nltk_data/packages/{tokenizers,taggers}

scripts/images/runtime-ray/Dockerfile

@@ -83,6 +83,7 @@ ENV PATH="$PATH:$JAVA_HOME/bin"
 WORKDIR /opt/runtime
 
 COPY scripts/images/runtime-ray/zh_core_web_sm-3.8.0-py3-none-any.whl /tmp/
+COPY scripts/images/common/nltk-data/ /tmp/nltk-data/
 
 ENV UV_LINK_MODE=copy
 
@@ -92,7 +93,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     && uv pip install -r /opt/runtime/deepdata/ops/pyproject.toml --system \
     && uv pip install "ray[default]>=2.9.0" --system \
     && uv pip install /tmp/zh_core_web_sm-3.8.0-py3-none-any.whl --system \
-    && python -c "import nltk; nltk.download('punkt_tab'); nltk.download('averaged_perceptron_tagger_eng')" \
+    && python -c "import zipfile, os; os.makedirs('/usr/local/nltk_data/packages/tokenizers', exist_ok=True); os.makedirs('/usr/local/nltk_data/packages/taggers', exist_ok=True); zipfile.ZipFile('/tmp/nltk-data/punkt_tab.zip').extractall('/usr/local/nltk_data/packages/tokenizers'); zipfile.ZipFile('/tmp/nltk-data/averaged_perceptron_tagger_eng.zip').extractall('/usr/local/nltk_data/packages/taggers')" \
     && echo "/usr/local/lib/ops/site-packages" > /usr/local/lib/python3.11/site-packages/ops.pth