Clean up nemo-retriever dependencies

[colesmcintosh]

Summary

• add runtime dependencies used by shipped nemo_retriever code to the core project dependencies
• move duplicated extra-only entries out of optional extras now covered by core dependencies
• add a test extra for MoviePy while constraining it to the Pillow-compatible 1.x line
• regenerate nemo_retriever/uv.lock

Closes #1392.

Notes

• The issue refers to api/pyproject.toml; on current main, the relevant manifest is nemo_retriever/pyproject.toml.
• I used opencv-python-headless rather than opencv-python because this project already suppresses opencv-python in uv overrides to avoid cv2 directory conflicts.
• Some packages listed in the older issue body, such as redis, python-docx, python-pptx, minio, and pymilvus, are not imported by the current tree and were not added as unused runtime dependencies.

Validation

• python -c "import pathlib,tomllib; tomllib.loads(pathlib.Path('nemo_retriever/pyproject.toml').read_text()); print('pyproject ok')"
• custom dependency manifest assertion for core/test dependency placement
• uvx --from uv uv lock --check --quiet from nemo_retriever/
• git diff --check

Not Run

• python -m pytest nemo_retriever/tests/test_nemotron_ocr_v2_nightly.py::test_local_extra_accepts_stable_ocr_2_and_newer_dev_releases could not start in the ambient Python because project dependencies such as pandas are not installed there.

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