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/v0.6.0.en.md

@@ -0,0 +1,37 @@
+# v0.6.0 — Release Notes
+
+**Date:** 2026-08-03 · **Tag:** [`v0.6.0`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.6.0)
+
+## New features
+
+- Complete modernization of all dependencies to the current major versions
+  (TypeScript 7, Vite 8, React 19.2, openid-client 6, zod 4, recharts 3, react-day-picker 10).
+
+## Fixes & improvements
+
+- CI build fixed via `allowBuilds` configuration for pnpm 11
+  (build scripts for esbuild & Co. are no longer blocked).
+- Image tagging simplified: only `latest` and `v*` tags, no more `nightly-*`/`sha-*` tags.
+- All dependencies pinned exactly; automatic updates via Renovate prepared
+  (`renovate.json`, `docs/dependency-policy.md`).
+
+## API changes
+
+- No breaking changes to the API. openid-client internally migrated to v6
+  (auth flow behaves identically).
+
+## Operations / upgrade
+
+- **Env vars:** unchanged. Node image pinned to `node:24.18.1-alpine`.
+- **Migration:** no database migration required.
+- **Breaking changes:** none.
+
+## Known limitations
+
+- `typedoc` (indirect orval dependency) shows a peer-dependency warning
+  (expects TypeScript 5.x/6.x, 7.x is installed) — harmless for build and runtime.
+
+## Links
+
+- Commit: [`2f66fff`](https://git.kubebase.de/admin/tool-evaluator/commit/2f66fff)
+- Tag: [`v0.6.0`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.6.0)