feat: classify sensitive columns locally

backend/python/sensitivity-ner-requirements.txt

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+# Optional offline CPU pack. Fully version-locked in its own venv; not part of the base image.
+--extra-index-url https://download.pytorch.org/whl/cpu
+accelerate==1.14.0
+annotated-types==0.8.0
+certifi==2026.7.22
+charset-normalizer==3.5.1
+filelock==3.32.5
+fsspec==2026.7.0
+gliner2[local]==2.0.0
+hf-xet==1.6.0
+huggingface-hub==0.36.2
+idna==3.19
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+mpmath==1.3.0
+networkx==3.6.1
+numpy==2.5.2
+packaging==26.3
+peft==0.20.0
+psutil==7.2.2
+pydantic==2.13.5
+pydantic-core==2.46.5
+PyYAML==6.0.3
+regex==2026.9.3
+requests==2.34.2
+safetensors==0.8.0
+sympy==1.14.0
+tokenizers==0.22.2
+torch==2.14.0+cpu
+tqdm==4.70.0
+transformers==4.57.6
+typing-extensions==4.16.0
+typing-inspection==0.4.4
+urllib3==2.7.0