Add SRI integrity hashes and crossorigin to CDN resources

[xihale]

上游已经修复了 Access-Control-Allow-Origin 缺失的相关问题，可以加入 integrity 验证确保资源安全。

[gemini-code-assist]

Summary of Changes

Hello @xihale, 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 significantly improves the security posture of the application by implementing Subresource Integrity (SRI) and appropriate crossorigin attributes for external CDN-hosted assets. This change ensures that resources like KaTeX and Mermaid are loaded securely, verifying their integrity against known cryptographic hashes and mitigating risks associated with compromised content delivery networks.

Highlights

• Enhanced Security for CDN Resources: Subresource Integrity (SRI) hashes have been added to all CDN-hosted KaTeX and Mermaid resources to ensure their authenticity and prevent tampering.
• Cross-Origin Resource Sharing (CORS) Configuration: The crossorigin="anonymous" attribute has been included for these CDN resources, which is essential for enabling SRI checks and preventing potential CORS-related issues.

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[gemini-code-assist]

Code Review

This pull request enhances security by adding Subresource Integrity (SRI) hashes and crossorigin attributes to all CDN-hosted resources. This is an excellent security practice that helps prevent attacks from a compromised CDN. The changes are correct and well-implemented. I've added a few minor suggestions to improve code readability by formatting some of the long lines.