refactor(api): Use new upload API

[pan93412]

Description (required)

Migrate to new upload API.

Related issues & labels (optional)

• Closes ZEA-4756
• Suggested label: enhancement

[Copilot]

Pull Request Overview

This PR refactors the upload flow in the API service to migrate to a new upload API. Key changes include the implementation of a SHA256 content hash, replacing multipart form data with JSON requests, and a new multi-step upload process.

Comments suppressed due to low confidence (3)

pkg/api/service.go:412

• [nitpick] The variable 'createUploadResp' represents an HTTP request, so renaming it (e.g., to 'createUploadReq') would clarify its purpose.

createUploadResp, err := http.NewRequestWithContext(ctx, "POST", constant.ZeaburServerURL+"/v2/upload", bytes.NewReader(createUploadBody))

pkg/api/service.go:480

• [nitpick] The variable 'prepareResp' is used for an HTTP request. Renaming it to something like 'prepareReq' would help avoid confusion with actual responses.

prepareResp, err := http.NewRequestWithContext(ctx, "POST",

pkg/api/service.go:500

• The function returns (nil, nil) without returning a valid service object after a successful upload, which may be unintended behavior.

return nil, nil