Add FastAPI backend with PostGIS-backed nearby search
FastAPI service backed by PostgreSQL+PostGIS: cities/places/place_content schema (normalized per-language, per-length content for easy future re-ingestion), Alembic migration, an iterative-radius-expansion nearby search endpoint, a name-search fallback for denied-location flows, and a YAML seed loader CLI. Verified end-to-end against a live Docker Postgres+PostGIS instance (migration, city seed, place/content CRUD, and nearby radius expansion all confirmed working via curl). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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backend/requirements.txt
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backend/requirements.txt
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fastapi==0.115.0
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uvicorn[standard]==0.30.6
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sqlalchemy==2.0.35
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psycopg[binary]==3.2.2
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geoalchemy2==0.15.2
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alembic==1.13.2
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pydantic==2.9.2
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pydantic-settings==2.5.2
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pyyaml==6.0.2
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