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

artifacts/toolrate/src/pages/docs.tsx

@@ -30,7 +30,6 @@ import {
   ExternalLink,
   FileText,
   GitBranch,
-  HelpCircle,
   Library,
   Menu,
   Search,
@@ -591,10 +590,6 @@ function SchemaView({ schema }: { schema: SchemaModel }) {
           {schema.description && <p className="text-muted-foreground">{schema.description}</p>}
         </div>
         <FieldTable fields={schema.fields} />
-        <p className="text-xs text-muted-foreground">
-          <HelpCircle className="h-3.5 w-3.5 inline mr-1" />
-          {t("docs.fieldHelpHint")}
-        </p>
       </div>
       <Toc headings={headings} title={t("docs.fields")} />
     </div>