feat(i18n): full app + docs localization (de/en)

- translate remaining pages/components (admin, analytics, redundancy,
  trash, compare, browse, watchlist, admin tools tab, category combobox,
  theme toggle, tool preview card, tool-new/edit) to t() calls
- locales: 453 keys each, parity verified
- docs: bilingual handbook + release notes via *.en.md variants,
  language-aware docs.tsx (markdown paths, nav titles, search index),
  LanguageSwitcher in docs header
- generate-docs: emit per-locale handbook/release/search output,
  localized index.json fields (fileEn/titleEn), en-aware snapshots

docs/releases/v0.8.1/handbook/plaene.en.md

@@ -0,0 +1,41 @@
+
+# Plans & Permissions
+
+toolr distinguishes **plans** (tier) and **roles**. Admins bypass all feature
+restrictions.
+
+## Plans
+
+| Plan | Description |
+| --- | --- |
+| **Free** | Basic functions: search, filter, view, analytics |
+| **Premium** | Additionally watchlist, compare, trash, costs |
+| **Enterprise** | All premium features + extended support |
+
+### Feature permissions
+
+Premium/Enterprise unlock the following features:
+
+| Feature | Function | Learn more |
+| --- | --- | --- |
+| `compare` | Compare tools | [Compare](/docs/handbook/vergleichen) |
+| `watchlist` | Favorites list | [Watchlist](/docs/handbook/watchlist) |
+| `trash` | Trash (soft-deleted tools) | [Trash](/docs/handbook/papierkorb) |
+| `costs` | Record cost/license models | [Recording costs](/docs/handbook/kosten) |
+
+If you are missing a feature, the app shows an **upgrade notice** with a link
+to the plan management.
+
+## Roles
+
+| Role | Permissions |
+| --- | --- |
+| **User** | Standard account: create/rate tools, edit your own tools |
+| **Admin** | All user rights + administration, audit log, redundancy, empty trash, tool links |
+
+Admins pass **all** feature checks — even without a premium plan.
+
+## Plan/role management
+
+The assignment of role and plan is managed by admins in the
+[Administration](/docs/handbook/administration) section (tab "Users").