T2-028: Add UploadService -- health data upload CRUD

Track: 2 — UI Revamp + AI Analytics
Section: Athion SDK
Status: [ ] Todo
Repo: athion-sdk
Branch: feature/T2-028-upload-service

Done When

Methods: uploadHealthData(file), uploadFoodPhoto(image), listUploads(), deleteUpload(id). Typed models

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