Add cusy namespace

pyproject.toml

src/cusy/polarizer/__init__.py

src/cusy/polarizer/api/__init__.py

src/cusy/polarizer/api/main.py

src/cusy/polarizer/api/search.py

src/cusy/polarizer/cli/__init__.py

src/cusy/polarizer/cli/serve.py

src/cusy/polarizer/config.py

src/cusy/polarizer/http.py

src/cusy/polarizer/log.py

src/cusy/polarizer/logging.toml

src/cusy/polarizer/models.py

src/cusy/polarizer/py.typed

src/cusy/polarizer/upstream/__init__.py

src/cusy/polarizer/upstream/base.py

src/cusy/polarizer/upstream/photon.py

tests/test_geo.py

uv.lock