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/v0.7.0.en.md

@@ -0,0 +1,35 @@
+# v0.7.0 — Release Notes
+
+**Date:** 2026-08-03 · **Tag:** [`v0.7.0`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.7.0)
+
+## New features
+
+- Version-bound **release documentation** in the app under `/docs`
+  (index + detail page per version, Markdown from `docs/releases/`).
+- Generated release template (`docs/releases/TEMPLATE.md`) and
+  sync step for the frontend build.
+
+## Fixes & improvements
+
+- `tsx` bumped to 4.23.4 — last outdated dependency in the workspace
+  (`pnpm outdated -r` is now empty).
+
+## API changes
+
+- No breaking changes to the API.
+
+## Operations / upgrade
+
+- **Env vars:** unchanged.
+- **Migration:** none.
+- **Breaking changes:** none.
+
+## Known limitations
+
+- The documentation is currently limited to release notes; a complete
+  API/field reference will follow in v0.8.0.
+
+## Links
+
+- Commit: [`520f917`](https://git.kubebase.de/admin/tool-evaluator/commit/520f917)
+- Tag: [`v0.7.0`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.7.0)