Migrate near-field table cache from HDF5 to SQLite

[xywei]

Summary

• replace NearFieldInteractionTableManager persistence in volumential/table_manager.py with sqlite-backed storage (nearfield_cache, nearfield_cache_kwargs, and nearfield_cache_meta) while keeping existing .hdf5 cache filenames
• drop the h5py dependency from setup.py, .test-conda-env-py3.yml, and .test-conda-env-py3-macos.yml
• add test/test_table_manager_sqlite_migration.py and raise a clear runtime error when a legacy HDF5 cache file is opened with the new sqlite backend

Testing

• on ipa: python -m pytest test/test_table_manager.py test/test_table_manager_sqlite_migration.py test/test_nearfield_potential_table.py test/test_nearfield_interaction_completeness.py -q (31 passed, 36 skipped)
• on ipa: python -m pytest test/test_volume_fmm.py::test_volume_fmm_laplace -vv -x passes for NVIDIA CUDA when run with the companion sumpy fix in fix: correct NVIDIA CUDA queue guard in run_opencl_fft inducer/sumpy#271

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[xywei]

Addressed both review comments in commit 27f1270 and pushed to this PR.

Changes made:

• normalize NumPy float/complex scalar serialization in table_manager (repr(float(value)) / repr(complex(value))) so round-tripping through sqlite kwargs works.
• fail fast in read-only mode for cache miss and force_recompute=True, and avoid recompute fallback on load corruption when read-only.
• added regression tests in test/test_table_manager_sqlite_migration.py for NumPy scalar roundtrip and read-only fail-fast behavior.

Validation on ipa:

• python -m pytest test/test_table_manager_sqlite_migration.py -q -> 5 passed
• python -m pytest test/test_table_manager.py test/test_table_manager_sqlite_migration.py test/test_nearfield_potential_table.py test/test_nearfield_interaction_completeness.py -q -> 35 passed, 36 skipped