Add requirements.txt for reproducibility (fixes #176)

requirements.txt

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+# DeepLense Core Dependencies
+# Addresses Issue #176: Add requirements.txt for reproducibility
+#
+# This file specifies the minimum required packages for running
+# the DeepLense pipeline. Pin versions for reproducible experiments.
+
+# Deep Learning Framework
+torch>=1.12.0
+torchvision>=0.13.0
+
+# Scientific Computing
+numpy>=1.21.0
+scipy>=1.7.0
+
+# Machine Learning & Evaluation
+scikit-learn>=1.0.0
+
+# Data Handling
+pandas>=1.3.0
+h5py>=3.6.0
+
+# Visualization
+matplotlib>=3.5.0
+seaborn>=0.11.0
+
+# Image Processing
+Pillow>=8.0.0
+
+# Configuration
+PyYAML>=6.0
+
+# Testing
+pytest>=7.0.0
+
+# Astronomy (optional, for LSST pipeline)
+# astropy>=5.0
+
+# Experiment Tracking (optional)
+# wandb>=0.12.0
+
+# Code Quality (development only)
+# black>=22.0
+# isort>=5.10
+# flake8>=4.0