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.en.md

@@ -0,0 +1,27 @@
+# v0.9.1 — Release Notes
+
+**Date:** 2026-08-05 · **Tag:** [`v0.9.1`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.9.1)
+
+## Fixes & Polish
+
+- **Documentation:** Release notes render correctly again on the help page. A
+  duplicated `releases/` path prefix in the versioned docs previously returned
+  an empty page (404).
+
+## API Changes
+
+- None.
+
+## Operations / Upgrade
+
+- **Migration:** none. **Breaking Changes:** none.
+
+## Known Limitations
+
+- Comparing was limited to 8 tools server-side; this is raised to 9 in v0.9.2
+  and consistently enforced in the client.
+
+## Links
+
+- Commit: [`e66a332`](https://git.kubebase.de/admin/tool-evaluator/commit/e66a332)
+- Tag: [`v0.9.1`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.9.1)