feat(c_api): add DiskANN index type support to C API#495
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Add complete DiskANN C API interfaces following existing HNSW/FTS patterns: - c_api.h: ZVEC_INDEX_TYPE_DISKANN constant, index params setter/getters, query params opaque type with CRUD (list_size/radius/is_linear/ is_using_refiner), query wiring for vector_query/group_by_vector_query/ sub_query, ZVEC_DISKANN_PARAMS convenience macro - c_api.cc: factory switch case, all function implementations with dynamic_cast type safety, to_string support - c_api_test.c: 3 standalone test functions + augmentations to 4 existing tests covering create/set/get/destroy, type-mismatch errors, NULL handling - examples/c/diskann_example.c: end-to-end example demonstrating DiskANN collection creation, batch insert, flush/index build, and search with list_size tuning Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Claude <noreply@anthropic.com>
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Add DiskANN C API interfaces