fix: upgrade devDependencies and migrate to eslint 10 flat config

- Upgrade eslint 8.31 → 10.1 with new flat config (eslint.config.js)
- Upgrade @vercel/ncc 0.36 → 0.38.4
- Replace eslint-config-airbnb-base + eslint-plugin-import with @eslint/js + @stylistic/eslint-plugin
- Remove stale overrides in package.json (word-wrap, semver)
- Remove obsolete eslint-disable comments from source files
- Add { cause } to rethrown error in rsyncCli.js
- Add .gitignore and CLAUDE.md
- Resolves all 3 npm audit vulnerabilities (flatted, minimatch, js-yaml)

src/index.js

@@ -27,7 +27,6 @@ const run = async () => {
   if (scriptBefore) {
     await remoteCmdBefore(scriptBefore, privateKeyPath, scriptBeforeRequired);
   }
-  /* eslint-disable object-property-newline */
   await sshDeploy({
     source, rsyncServer, exclude, remotePort,
     privateKeyPath, args, sshCmdArgs