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/v0.8.0.en.md

@@ -0,0 +1,46 @@
+# v0.8.0 — Release Notes
+
+**Date:** 2026-08-03 · **Tag:** [`v0.8.0`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.8.0)
+
+## New features
+
+- **Complete documentation site** in mkdocs look under `/docs`:
+  - **Manual** with understandable explanations of all features
+    (Getting started, creating a tool, evaluations, comparing, watchlist,
+    analytics, administration, data model).
+  - **Automatically generated reference** from `lib/api-spec/openapi.yaml`:
+    all endpoints and data fields (type, required status, constraints) —
+    this guarantees that *every* feature is documented.
+  - **Search** across the manual, endpoints, and fields.
+  - **Version dropdown**: older releases keep their full field/endpoint
+    reference as a snapshot.
+  - **Repo link** to the source in the top right.
+- **Help buttons (?) in forms** (NetBox style): next to each field,
+  an icon jumps directly to the field description in the docs.
+
+## Fixes & improvements
+
+- Docs generator `scripts/src/generate-docs.mjs` replaces the previous
+  `sync-release-docs.mjs` (OpenAPI parsing, manual, search index, snapshots).
+- Documentation for v0.7.0 backfilled.
+
+## API changes
+
+- No breaking changes to the API.
+
+## Operations / upgrade
+
+- **Env vars:** unchanged.
+- **Migration:** none.
+- **Breaking changes:** none.
+
+## Known limitations
+
+- Manual & reference apply to the current version; older versions
+  show their release notes and a reference snapshot, if generated at
+  release time (`node scripts/src/generate-docs.mjs --snapshot vX.Y.Z`).
+
+## Links
+
+- Commit: [`6c92b63`](https://git.kubebase.de/admin/tool-evaluator/commit/6c92b63)
+- Tag: [`v0.8.0`](https://git.kubebase.de/admin/tool-evaluator/releases/tag/v0.8.0)