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fix(security): use of assert statements for input validation in p (#435)

The file `dask_image/ndfourier/_utils.py` uses Python `assert` statements for input validation (e.g., lines checking `issubclass(dtype, numbers.Real)`). Assert statements can be disabled globally when Python is run with the `-O` (optimize) flag, which would bypass these checks entirely. This could allow invalid inputs to propagate through the code, potentially causing crashes, incorrect results, or undefined behavior in production environments where optimized Python execution is used.

Signed-off-by: tomaioo <203048277+tomaioo@users.noreply.github.com>

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