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

lib/api-spec/openapi.yaml

@@ -924,6 +924,37 @@ paths:
                 items:
                   $ref: "#/components/schemas/AuditLog"
 
+  /admin/tools/import:
+    post:
+      operationId: importTools
+      tags: [admin]
+      summary: Import tools in bulk (premium feature, admin only)
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/ToolImportBody"
+      responses:
+        "200":
+          description: Import result
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ToolImportResponse"
+        "400":
+          description: Validation or parse error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ErrorResponse"
+        "403":
+          description: Premium feature required
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ErrorResponse"
+
 components:
   schemas:
     HealthStatus:
@@ -1191,6 +1222,39 @@ components:
           items:
             type: string
 
+    ToolImportBody:
+      type: object
+      required: [data]
+      properties:
+        format:
+          type: string
+          enum: [auto, csv, json, yaml]
+          default: auto
+        delimiter:
+          type: string
+          enum: [auto, comma, semicolon, tab]
+          default: auto
+        data:
+          type: string
+
+    ToolImportResponse:
+      type: object
+      required: [imported, total, errors]
+      properties:
+        imported:
+          type: integer
+        total:
+          type: integer
+        errors:
+          type: array
+          items:
+            type: object
+            properties:
+              row:
+                type: integer
+              error:
+                type: string
+
     ToolUpdate:
       type: object
       properties: