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/watchlist.en.md

@@ -0,0 +1,33 @@
+
+# Watchlist
+
+The **watchlist** is a personal favorites list. You can open and compare the
+tools in it at any time with a click.
+
+> The watchlist is a **premium feature** (Premium/Enterprise) and is always
+> available to admins.
+
+## Prerequisite
+
+You need a plan with the `watchlist` permission. If it is missing, a note
+about switching plans appears at the bookmark
+(see [Plans & permissions](/docs/handbook/plaene)).
+
+## Saving a tool
+
+- On every card/row in the **Browse tools** section you will find the
+  **bookmark icon**.
+- A click saves the tool to your watchlist — the icon becomes filled.
+- Clicking it again removes it.
+
+## Viewing the watchlist
+
+Open the watchlist via the user menu or the sidebar. It shows all saved tools
+as cards. The filled bookmark on a card removes the tool from the list.
+
+## Where is the watchlist stored?
+
+The watchlist is a list of tool IDs in your **user preferences**. This way it
+is linked to your account across devices.
+
+API reference: [`GET /auth/me/watchlist`](/docs/reference/endpoints/auth#getMeWatchlist).