bohdansolovie e0f0eb277d Fix upload stream handling to prevent truncated files (#14267) ...

## Summary
- Replace single `Read()` call in Go upload service with `io.ReadAll()`.
- Prevent potential truncated/corrupted file content during multipart
upload.
- Keep existing API behavior unchanged while fixing data integrity risk.

## Root Cause
`io.Reader.Read()` may return fewer bytes than requested without an
error. The previous implementation read once into a full buffer and
assumed all bytes were populated.

## Test plan
- Upload files of multiple sizes and verify uploaded content integrity.
- Confirm upload endpoint still returns successful responses.
- Verify downstream document parsing works on uploaded files.

## Issues
Closes #14266

2026-04-22 16:32:38 +08:00

27 KiB

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