feat: implement flow parameter support in comparison plotters (fixes #594)

Add comprehensive support for flow parameter in comparison plotting functions
including plot_data_model_comparison(), plot_two_hist_comparison(), and
plot_model(). Key improvements:

- Preserve original histogram flow information through plotting pipeline
- Pass original histograms to histplot() for proper flow bin detection
- Prevent xlim reset when flow="show" to preserve extended axis range
- Filter 'flow' parameter before passing to funcplot() compatibility
- Add flow-aware ratio computation in comparison panels

Supports all flow options: "hint" (diamond markers), "show" (extended range),
"sum" (included in edge bins), and "none".

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: andrzejnovak

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