Oucru-Innovations / vital-DSP / 25768103401

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fix(utils): correct logic errors, silent failures, and bottlenecks across utils modules

Bug fixes:
- normalization/scaler: constant-signal std=0 path returned zeros,
  silently discarding signal data — now returns zero-centered values
- find_peaks: prominence right-base slice included the peak itself,
  causing systematic underestimation of prominence
- coherence: divided by psd_x*psd_y without zero guard, producing
  nan/inf for constant signals
- synthesize_data: ECG z-normalization had no divide-by-zero guard
  when ODE output is constant; ODE fallback w0 didn't guard rr=0
- optimized_memory_manager: np.finfo() called on integer dtypes
  (raises AttributeError); signal entropy used density histogram
  producing dimensionally wrong probabilities (nan risk)

Perf:
- attention_weights.linear: replace double linspace + np.sum with
  single linspace and O(1) analytic sum (size*(size+1)/2)
- mother_wavelets db/sym: replace O(order²) convolve loop with
  np.poly1d([1,1])**order direct polynomial exponentiation
- synthesize_data.rrprocess: replace np.append (always copies) with
  np.concatenate

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