chore(cli): remove unused config files

Remove unused files from .config/:
- esbuild-inject-cjs-globals.mjs (not referenced anywhere)
- esbuild.sea-bootstrap.build.mjs (script defined but never called)
- packages/*.json (old package.json templates, not used)

Kept:
- esbuild-inject-import-meta.mjs (used by esbuild.cli.build.mjs)
- esbuild.cli.build.mjs (used by build script)
- esbuild.index.config.mjs (used by build script)
- eslint.config.mjs (used by lint script)
- tsconfig.*.json (used by TypeScript builds)

Author: jdalton