included low pass filter in package and add to plot_data example

requirements.txt

@@ -1,13 +1,27 @@
-# CuPy - Install the appropriate version based on your CUDA version:
-# For CUDA 12.x: pip install cupy-cuda12x>=12.3.0
-# For CUDA 13.x: pip install cupy-cuda13x>=13.0.0
-# Or use extras: pip install orisys[cuda12] or pip install orisys[cuda13]
+# Runtime dependencies for editable / source installs.
+# Prefer extras from pyproject.toml:
+#   pip install -e .
+#   pip install -e ".[gui]"
+#   pip install -e ".[cuda12]"
+#   pip install -e ".[cuda13]"
+#   pip install -e ".[gui,cuda12]"
+# PyPI users: pip install orisys / "orisys[gui]" / "orisys[cuda12]"
 
+# Core (same as [project.dependencies])
 numpy>=1.24.4
-opencv_python>=4.10.0.84
-scipy==1.13
-setuptools>=45.2.0
-av
-numba
-pyqt5
-pyqtgraph
+opencv-python>=4.10.0.84
+scipy>=1.10.1
+numba>=0.59.0
+
+# GUI extras: pip install -e ".[gui]"
+# open3d>=0.17.0
+# pyqt5>=5.15
+# pyqtgraph>=0.13
+
+# CUDA extras (pick one CUDA major version)
+# CUDA 12.x: pip install -e ".[cuda12]"   -> cupy-cuda12x>=12.3.0
+# CUDA 13.x: pip install -e ".[cuda13]"   -> cupy-cuda13x>=13.0.0
+# Alias:     pip install -e ".[cuda]"     -> same as cuda12
+
+# Optional video tooling (not an orisys extra)
+# av