[Feature] Deepseek-OCR model support: PDF format

[zixuanzhang226]

Checklist

• 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 2. Please use English, otherwise it will be closed.

Motivation

The goal is to support the Deepseek-OCR model to handle PDF format input, in addition to single-image input.

Related resources

No response

[shoted]

+1