feat(nlp-service): scaffold — models, requirements, CLAUDE.md

Task 1: Create standalone FastAPI service scaffold with models, test framework,
and documentation. Includes ParseRequest, ParseResponse Pydantic models matching
OllamaExtraction contract, plus three passing tests validating model validation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nlp-service/requirements.txt

@@ -0,0 +1,6 @@
+fastapi[standard]==0.115.6
+uvicorn[standard]==0.34.0
+spacy>=3.8,<4.0
+dateparser>=1.2,<2.0
+pytest>=8.0,<9.0
+httpx>=0.28,<1.0