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/vergleichen.en.md

@@ -0,0 +1,42 @@
+
+# Compare
+
+With the compare function you can put several tools **side by side** —
+ideal for making a well-informed decision.
+
+> Comparing is a **premium feature** (Premium/Enterprise) and is always
+> available to admins.
+
+## Selecting tools
+
+1. In the **Browse tools** section, click the **compare icon** (scales) on
+   each card/row.
+2. The **compare bar** appears at the bottom with the selected tools as
+   chips. You can remove individual tools (×) or clear the selection.
+3. Click **Compare (N)** to go to the compare view.
+
+> Without a premium plan the button is locked (lock icon). The dialog takes
+> you to the plan switch
+> (see [Plans & permissions](/docs/handbook/plaene)).
+
+## The compare view
+
+The view shows a table with one column per tool. Rows:
+
+| Row | Content |
+| --- | --- |
+| **Rating** | Stars + value (e.g. `4.2/5`) |
+| **Usefulness** | Value (X.X/5) |
+| **Usability** | Value (X.X/5) |
+| **Number of ratings** | Count |
+| **Description** | Text |
+| **Features** | Badges |
+| **Tags** | Badges |
+| **Last updated** | Date |
+
+The **best value** per row is highlighted (with trophy icon).
+
+## API
+
+The compare view reads the data via
+[`GET /compare`](/docs/reference/endpoints/tools#listCompareTools).