docs: cut to v0.9.0 with unified .de/.en naming

- Remove all prior release notes and version snapshots (v0.6.0-v0.8.6)
- Rename handbook to *.de.md; keep *.en.md
- New release notes v0.9.0.de.md/.en.md with v0.9.0 snapshot
- generate-docs.mjs: .de/.en convention incl. search index and en-fallback
- docs.tsx: release fallback now uses version.de.md
- Wording: neutral tagline, anonymous user, no gender forms
- Add docs/examples/import-tools.yaml and link from administration docs

docs/releases/v0.9.0/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)