feat: compare limit 9, format-aware import placeholder, help links

- Raise compare limit from 8 to 9 (server + client, toast on overflow)
- Make import textarea placeholder match selected format (CSV/JSON/YAML/auto)
- Add GuideHelp links to admin create/edit user dialogs and tool import dialog

docs/releases/v0.9.1/handbook/analytics.en.md

@@ -0,0 +1,29 @@
+
+# Analytics
+
+The **Analytics** area (`/analytics`) is a public dashboard with
+metrics and charts based on all tools and ratings.
+
+## Metrics (KPI cards)
+
+- **Number of tools** — how many tools are recorded in the catalog.
+- **Number of ratings** — how many ratings were submitted in total.
+- **Active categories** — how many categories exist.
+- **Average rating** — global combined value.
+
+## Charts
+
+| Chart | Content |
+| --- | --- |
+| **Top 8 tools** | Bar chart of the tools with the highest combined score (0–5) |
+| **Tools per category** | Radar chart of the number of tools per category |
+| **Score distribution** | Two horizontal bar charts (usefulness & usability) per star |
+
+The charts are interactive (tooltips on hover).
+
+## API
+
+- [`GET /analytics/summary`](/docs/reference/endpoints/analytics#getAnalyticsSummary)
+- [`GET /analytics/top-tools`](/docs/reference/endpoints/analytics#getTopTools)
+- [`GET /analytics/by-category`](/docs/reference/endpoints/analytics#getAnalyticsByCategory)
+- [`GET /analytics/rating-distribution`](/docs/reference/endpoints/analytics#getRatingDistribution)