Oucru-Innovations / vital-DSP / 25766677944

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docs+fix: add tutorial notebooks, fix ReadTheDocs rendering, correct module bugs and APIs

Docs:
- Add 6 new tutorial notebooks: physiological_features, preprocess,
  respiratory_analysis, feature_engineering_autonomic, advanced_computation,
  signal_decomposition
- Fix ReadTheDocs silent notebook drop by removing nbsphinx/jupyter_sphinx
  conflict — myst_nb is now sole .ipynb handler
- Update sample_notebooks.rst toctree from 8 to 17 entries
- Remove nbsphinx from docs/requirements.txt
- Rewrite examples.rst with verified correct APIs throughout

Bug fixes:
- ICASignalDecomposition: correct whitening matrix formula and FastICA
  deflation update with symmetric SVD orthogonalization
- TransferEntropy: clamp negative slice indices to 0 to guard k != l edge
  cases; fix surrogate FFT conjugate symmetry indexing
- RealTimeAnomalyDetection: guard divide-by-zero in z-score on constant
  window; fix SimpleAutoencoder/SimpleLSTM to accept scalar or 1-D input
- ConvolutionalAutoencoder: crop/pad decoder output to exactly match input
  length after UpSampling1D on odd-length sequences

Perf:
- MFCC: vectorize triangular filterbank construction (eliminates inner loops)

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