fix(vite): add configured headers for devtool-related response

[nighca]

server.headers in vite configuration is now ignored by __devtool__ related requests, which are handled by sirv.

This PR applies server.headers in vite configuration to these requests' response.

This PR fixes #565.

[netlify]

✅ Deploy Preview for vue-devtools-docs canceled.

Name	Link
🔨 Latest commit	5294d4b
🔍 Latest deploy log	https://app.netlify.com/sites/vue-devtools-docs/deploys/673ffff5aa8e8d00085adcd3

[pkg-pr-new]

Open in Stackblitz

@vue/devtools-applet

pnpm add https://pkg.pr.new/@vue/devtools-applet@710

@vue/devtools-core

pnpm add https://pkg.pr.new/@vue/devtools-core@710

@vue/devtools

pnpm add https://pkg.pr.new/@vue/devtools@710

@vue/devtools-api

pnpm add https://pkg.pr.new/@vue/devtools-api@710

@vue/devtools-kit

pnpm add https://pkg.pr.new/@vue/devtools-kit@710

vite-plugin-vue-devtools

pnpm add https://pkg.pr.new/vite-plugin-vue-devtools@710

commit: 5294d4b

[webfansplz]

@nighca I tested this with use case #565, but the issue still seems to exist. You can reproduce it with pnpm run build && pnpm run play