postinstall.mjs missing from published npm package; || true breaks on Windows

[ElSirGuti]

Two bugs in the published oc-anthropic-multi-account@1.0.17 package:

1. postinstall.mjs not included — The scripts.postinstall runs node postinstall.mjs, but postinstall.mjs is not listed in the files field of package.json (only dist and README.md are). The file doesn't exist in the installed package, causing a MODULE_NOT_FOUND error.
2. || true is POSIX-only — The postinstall script uses node postinstall.mjs || true. On Windows CMD, true is not a valid command. This should use a cross-platform alternative like || node -e "0" or || echo ok.
   Fix: Either include postinstall.mjs in the files array or inline the postinstall logic directly in the script field (or remove it if it's only needed during development).