Add Insights page to participatory space admin panel

[antopalidi]

🎩 What? Why?

• Add an Insights sub-menu to each participatory space
• Show a heatmap pivot table crossing user profile fields (gender, age, country, location, postal code) with participation metrics (participants, proposals created/supported, comments, budget votes)
• Admins can switch metrics and swap axes via dropdowns to explore who participates and how
• Both fields and metrics are configurable via config_accessor (insight_fields, insight_metrics)

📌 Related Issues

Fixes #14

Testing

1. Open any Participatory Process or Assembly in admin → click Insights in the sidebar
2. Switch metric / rows / columns via dropdowns — table updates accordingly
3. Verify heatmap coloring, legend, "Non specified" gray cells, and empty state

📷 Screenshots

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/insights-participatory-space

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