Delete Document

Soft-deletes a document by setting `deletedAt`. The document is immediately excluded from list/get responses. Hard delete and restore exist at the service layer but are not exposed through any public route. `data` is `null` on success — the deleted document is not echoed back.

curl -X DELETE "https://example.com/api/v1/documents/string"

{  "success": true,  "message": "Document deleted successfully",  "data": null}