Cache bundle assets for slow network connections

[hwanseoc]

What Changed

This adds long-lived cache headers for built files served from /assets/*.

/assets/* gets Cache-Control: public, max-age=31536000, immutable

Why

The entire JS/CSS payload is about 3 MB, which on a slow connection means a page load can take more than 10 seconds on every reload.

The cached files are this scoped to /assets/* only. These files are Vite build outputs with content-hashed filenames, so I expect them to be safe to cache aggressively even for development.

UI Changes

No UI or interaction change.

Checklist

• This PR is small and focused
• I explained what changed and why
• No UI screenshots were needed because there is no UI change
• No interaction video was needed because there is no interaction change

Note

Cache static bundle assets with immutable Cache-Control headers for slow network connections

Adds Cache-Control: public, max-age=31536000, immutable to HTTP responses for files served under the assets/ path in wsServer.ts. Files outside assets/ continue to be served without cache headers. A test is added to verify the header is present for hashed asset filenames.

^{Macroscope summarized c40dd7e.}

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[Copilot]

Pull request overview

Adds aggressive caching headers for Vite-built static assets served by the server to improve reload performance on slow networks.

Changes:

• Set Cache-Control: public, max-age=31536000, immutable for static files under /assets/*.
• Refactor static-file response code to build a headers object before responding.
• Add a server test asserting the cache header is present for /assets/... requests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
apps/server/src/wsServer.ts	Adds conditional Cache-Control header when serving static files under the assets/ prefix.
apps/server/src/wsServer.test.ts	Adds a test ensuring /assets/* responses include the immutable cache header.

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