phsl / new-api

🎨 refactor(ui): merge “Content Configuration” into “Basic Information” card in EditPrefillGroupModal

- Move `items` field (`JSONEditor` for endpoint type, `Form.TagInput` otherwise) into the first “Basic Information” card
- Remove the second “Content Configuration” card and its header; consolidate to a single-card layout
- Preserve form initialization, validation, and submit logic; API payload structure remains unchanged
- Improves clarity and reduces visual clutter without altering behavior
- Lint passes

Affected file:
- `web/src/components/table/models/modals/EditPrefillGroupModal.jsx`

No breaking changes.