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/api-server/src/middleware/feature.ts

@@ -2,8 +2,8 @@ import { type Request, type Response, type NextFunction } from "express";
 
 const TIER_FEATURES: Record<string, string[]> = {
   free: ["browse", "rate", "search"],
-  premium: ["browse", "rate", "search", "similar-tools", "costs", "redundancy", "analytics-advanced", "trash", "compare", "watchlist"],
-  enterprise: ["browse", "rate", "search", "similar-tools", "costs", "redundancy", "analytics-advanced", "trash", "compare", "watchlist", "sso", "audit-export", "api-access"],
+  premium: ["browse", "rate", "search", "similar-tools", "costs", "redundancy", "analytics-advanced", "trash", "compare", "watchlist", "tool-import"],
+  enterprise: ["browse", "rate", "search", "similar-tools", "costs", "redundancy", "analytics-advanced", "trash", "compare", "watchlist", "tool-import", "sso", "audit-export", "api-access"],
 };
 
 export function getEntitlements(tier: string | undefined, role: string | undefined): string[] {