fix: update serve-handler to 6.1.7, resolving minimatch 3.1.x security alerts

[chloe41427]

Updates serve-handler from 6.1.6 → 6.1.7, which bumps its pinned minimatch dependency from 3.1.2 → 3.1.5.

Resolves Dependabot security alerts:

• Add missing blanks in doc #48 (minimatch < 3.1.3, ReDoS)
• build(deps): bump sass from 1.82.0 to 1.83.0 #50 (minimatch < 3.1.4, ReDoS)
• build(deps): bump the docusaurus group with 5 updates #52 (minimatch < 3.1.3, ReDoS)

Change: 7 lines in package-lock.json only. No direct dependencies changed.

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⚠️ Note: Alert #53 (serialize-javascript) remains open. It is blocked by @docusaurus/bundler pinning copy-webpack-plugin ^11.0.0, which requires serialize-javascript 6.x. The fix (7.0.3+) requires copy-webpack-plugin v14, a major version bump that Docusaurus has not yet adopted. Needs to be tracked upstream.