[Docs] Add docs for Qwen3-VL image and video support

[adarshxs]

Added standalone page for Qwen3 VL model family.

cc @mickqian

[gemini-code-assist]

Summary of Changes

Hello @adarshxs, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive documentation for integrating and utilizing the Qwen3-VL multimodal large language model within SGLang. The new guide covers the process of launching the model and provides practical code examples for sending both image and video input requests, thereby enhancing SGLang's support for advanced multimodal capabilities and making it easier for users to leverage these features.

Highlights

• New Documentation Page: Added a dedicated documentation page for the Qwen3-VL model, detailing its usage within SGLang.
• Qwen3-VL Launch Instructions: Included clear instructions on how to launch the Qwen3-VL model using the sglang.launch_server command.
• Image and Video Input Examples: Provided Python code examples demonstrating how to send both image and video input requests to the Qwen3-VL model.
• Documentation Navigation Update: Updated the main documentation index to include the newly added Qwen3-VL usage guide, making it accessible through the table of contents.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the Qwen3-VL model family, covering image and video input support. The new documentation page is well-structured and provides clear examples for launching the server and sending requests. I've identified a small but critical issue in the server launch command example that would cause it to fail. The suggested fix will ensure the command is runnable as-is.

[mickqian]

We could mention:

python3 -m sglang.launch_server --model-path Qwen/Qwen3-VL-235B-A22B-Instruct-FP8 --tp 8 --ep 8

[adarshxs]

done

[mickqian]

thanks, but sorry for the confusion, I meant we should list commands for both models😂

[mickqian]

And also, please make the examples in this doc runs ok

[adarshxs]

Yes i've ran these examples for both video and image and they work well

[merrymercy]

1. list usage for both fp8 and non fp8
2. list the command for more hardware (A100, H200)
3. try to match the vllm repice https://docs.vllm.ai/projects/recipes/en/latest/Qwen/Qwen3-VL.html