Add package support metadata

[kingshuaishuai]

Summary

Add standard npm package support metadata:

• homepage points to the project README
• bugs.url points to the GitHub issue tracker

Verification

node - <<'NODE'
const fs = require('fs')
const pkg = JSON.parse(fs.readFileSync('package.json', 'utf8'))
if (pkg.homepage !== 'https://github.com/rehooks/component-size#readme') process.exit(1)
if (pkg.bugs?.url !== 'https://github.com/rehooks/component-size/issues') process.exit(1)
console.log('metadata ok')
NODE
npm pack --dry-run --ignore-scripts
git diff --check

Related metadata bounty: charles-openclaw/charles-microbounties#645