fix:add binary attributes for image files to prevent line ending conversion

[OneZero-Y]

What type of PR is this?

🐛 Problem

When checking out image files from upstream in WSL/Linux environments, these files incorrectly show as "modified":

• website/static/img/chat.png
• website/static/img/dashboard/config.png
• website/static/img/dashboard/grafana.png
• website/static/img/dashboard/landing.png
• website/static/img/dashboard/openwebui.png
• website/static/img/dashboard/topology.png

Root Cause:

The .gitattributes file has * text=auto and * text eol=lf configured, but doesn't explicitly specify how to handle binary files like images. This causes Git to incorrectly treat PNG images as text files and attempt CRLF → LF line ending conversion, which corrupts the binary file content.

✅ Solution

Add binary attribute declarations for common image formats in .gitattributes:

# Binary files - treat as binary, no line ending conversion
*.png binary
*.jpg binary
*.jpeg binary
*.gif binary
*.ico binary
*.svg binary

📝 Changes

• Update .gitattributes to add binary attribute for image file types

🎯 Impact

• ✅ Fixes the issue where image files are incorrectly modified during checkout
• ✅ Prevents future binary image files from experiencing the same problem
• ✅ No impact on existing code logic, only changes how Git handles these file types

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[github-actions]

👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 Root Directory

Owners: @rootfs, @Xunzhuo
Files changed:

• .gitattributes

---

🎉 Thanks for your contributions!

This comment was automatically generated based on the OWNER files in the repository.

[carlory]

Test this PR on macOS:

Affected files:

(base) ➜  semantic-router git:(main) ✗ git rm --cached -r -f .
(base) ➜  semantic-router git:(main) ✗ git add .
(base) ➜  semantic-router git:(main) ✗ git status
On branch main
Your branch is up to date with 'origin/main'.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
	modified:   .gitattributes
	modified:   .github/workflows/docker-publish.yml

I tested with my changes on macOS,

# Auto detect text files and perform LF normalization
* text=auto eol=lf

and it got same result.

(base) ➜  semantic-router git:(main) ✗ git diff .github/workflows/docker-publish.yml

output:

[rootfs]

@yuluo-yx PTAL, thanks