Add patient file attachments: a new PatientAttachment entity (record-scoped,
CASCADE) + repository, and endpoints GET /patient/{uuid}/attachments,
POST /patient/{uuid}/attachment (raw-body upload) and DELETE
/patient/attachment/{uuid} (owner-scoped). Factor the shared raw-body upload
logic into FileUploadService. Wire the "ضمیمه" tab in PatientDetailPage
(upload + list + delete). PHPUnit covers list/delete/ownership; Vitest covers
the tab. API docs updated.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>