feat: Add 'Client-Platform' header for server processing for PP-OCR and PP-Structure

[Bobholamovic]

No description provided.

[fanlv]

Why do we need to add this field?

[Bobholamovic]

Why do we need to add this field?

This is a new specification introduced for the official PaddleOCR service. By identifying the source of client requests, we will be able to implement additional server-side extensions in the future, such as providing special handling for certain clients or enabling more fine-grained traffic control.

[fanlv]

The license/CLA status check seems to have an issue. I’ll try closing and reopening the PR.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/infra/document/ocr/impl/ppocr/ppocr.go	0.00%	1 Missing ⚠️
...d/infra/document/parser/impl/ppstructure/parser.go	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
backend/infra/document/ocr/impl/ppocr/ppocr.go	0.00% <0.00%> (ø)
...d/infra/document/parser/impl/ppstructure/parser.go	0.00% <0.00%> (ø)

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