fix: update docs endpoint test and add Zammad settings metadata

- Update test_docs_endpoint to use new /admin/api-docs path
- Add SETTING_METADATA entries for zammad_url, zammad_chat_enabled,
  zammad_chat_id, zammad_form_enabled, support_email

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_api.py

@@ -46,7 +46,7 @@ class TestHealthEndpoints:
 
     def test_docs_endpoint(self, client: TestClient):
         """Test that API documentation is accessible."""
-        response = client.get("/docs")
+        response = client.get("/admin/api-docs")
         assert response.status_code == 200
         assert "swagger" in response.text.lower() or "openapi" in response.text.lower()