fix: update normalization constant calculation in SmoothedPowerlawPrimaryMassRatio

[Qazalbash]

No description provided.

[gemini-code-assist]

Code Review

This pull request wraps the trapezoidal integration result for the primary mass distribution normalization constant in a logarithm (jnp.log) to correctly compute _logZ. The reviewer notes that directly applying jnp.log without safety guards can lead to numerical instability, such as underflow to zero resulting in -inf or NaN values. They suggest adding a guard using jnp.where to handle non-positive or invalid integration results safely.

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