fix(server): serve static assets with standard MIME types

[Boyeep]

Summary

• add standard MIME types for common web assets including WebAssembly, media, manifests, and documents
• match file extensions case-insensitively across cached, filesystem, and image passthrough paths
• make the existing WASM compression eligibility reachable by emitting application/wasm

Next.js parity

Next.js static serving delegates MIME lookup to its compiled send/mime database. This ports the relevant common web-asset behavior without adding a runtime dependency.

Test plan

• pnpm test tests/static-file-cache.test.ts tests/serve-static.test.ts (76 passed)
• staged vp check --fix passed

[pkg-pr-new]

Open in StackBlitz

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npm i https://pkg.pr.new/vinext@2713

commit: 8163ecf

[github-actions]

Performance benchmarks

Compared 8163ecf against base 05eee9f using alternating same-runner rounds. Next.js was unchanged and skipped.

0 improved · 1 regressed · 5 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	132.4 KB	132.4 KB	⚫ -0.0%
Client entry size (gzip)	vinext	119.7 KB	119.7 KB	⚫ -0.0%
Dev server cold start	vinext	2.84 s	2.92 s	🔴 +2.7%
Production build time	vinext	3.15 s	3.15 s	⚫ -0.0%
RSC entry closure size (gzip)	vinext	103.3 KB	103.3 KB	⚫ +0.0%
Server bundle size (gzip)	vinext	177.8 KB	177.8 KB	⚫ +0.0%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}