IntelPython / dpnp / 26509618926

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Fix `dpnp.tensor.expm1` handling of complex(+-0, 0)  (#2926)

This PR proposes to fix issue #2878 where
`dpnp.tensor.expm1(complex(-0.0, 0.0))` returned `-0.0 + 0.0j` on CPU
instead of `0.0 + 0.0j` as required by the Array API specification

The fix adds an explicit special-case branch for `complex(±0, 0)` in
`expm1.hpp` so CPU and GPU behavior are now consistent and compliant
with the specification.

Also `test_expm1_special_cases` test was extended to cover
`complex(-0.0, 0.0)`

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