feat(import): bulk tool import (CSV/JSON/YAML) for admins; NetBox-style help button

- Add POST /admin/tools/import with format auto-detect, CSV delimiters
  (comma/semicolon/tab), per-row validation via CreateToolBody, bulk insert,
  audit log entries per imported tool; gated by new 'tool-import' feature
  flag (premium/enterprise; admins always pass)
- Add tool-import-dialog UI (format tabs, delimiter select, textarea, file
  upload, result/error list) behind hasFeature('tool-import')
- Replace FieldHelp question marks and bare GuideHelp links with a NetBox-style
  'Hilfe/Help' outline button (HelpCircle + text) in form headers only
- Sync locales to 482 keys per language (de/en), update handbook docs
  (administration import section, index/plaene feature tables), regenerate
  API client + zod schemas, add yaml dependency

docs/handbook/administration.en.md

@@ -36,6 +36,46 @@ Central access to the tool catalog.
 - **Bulk action:** select multiple tools and move them to the trash
   (confirmation dialog; soft-deleted tools are removed from all public views
   and can be restored or permanently deleted).
+- **Import** (premium): via the **Import** button at the top right, multiple
+  tools can be created at once. The format is detected automatically (CSV,
+  JSON or YAML); for CSV the delimiter can be chosen (auto-detect, comma,
+  semicolon or tab). Data can be pasted directly into the form or uploaded
+  as a file.
+
+  Supported fields: `name` (required), `description`, `category`, `websiteUrl`,
+  `iconUrl`, `features`, `tags` (`features`/`tags` are `|`-separated lists).
+
+  **CSV example:**
+
+  ```csv
+  name;description;category;features;tags
+  Grafana;Observability and dashboard platform;Monitoring;Dashboards|Alerts;devops
+  Prometheus;Time-series database;Monitoring;Metrics;devops
+  ```
+
+  **JSON example:**
+
+  ```json
+  [
+    { "name": "Grafana", "category": "Monitoring", "features": ["Dashboards"] },
+    { "name": "Prometheus", "category": "Monitoring" }
+  ]
+  ```
+
+  **YAML example:**
+
+  ```yaml
+  - name: Grafana
+    category: Monitoring
+    features:
+      - Dashboards
+  - name: Prometheus
+    category: Monitoring
+  ```
+
+  During import, individual faulty rows are skipped and listed with their row
+  number; correct rows are still created. Every import produces audit-log
+  entries.
 
 ## "Audit log" tab