Make SVM visualization mesh step size configurable

[Copilot]

The mesh grid step size in plot_decision_boundary() was hardcoded as 0.02, making it difficult to adjust visualization resolution for different use cases.

Changes:

• Added mesh_step_size: 0.02 parameter to config.yaml under models.svm
• Added optional step_size parameter to plot_decision_boundary() method
• Falls back to config value when not specified, with final default of 0.02 if config missing
• Updated docstring to explain resolution impact

Usage:

# Use default from config
svm.plot_decision_boundary(X, y)

# Override for higher resolution
svm.plot_decision_boundary(X, y, step_size=0.01)

# Or configure globally in config.yaml
models:
  svm:
    mesh_step_size: 0.01  # Higher resolution plots

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