fix: "Directory import not supported" error

[kimdoyoung0319]

Environment

Node.js 24.3.0

Problem

With the ES Module import syntax, the library does not properly work with the following error:

[ERR_UNSUPPORTED_DIR_IMPORT]: Directory import '.../node_modules/@origranot/ts-logger/lib/esm/enums' is not supported resolving ES modules imported from .../node_modules/@origranot/ts-logger/lib/esm/index.mjs

This originates from the module import syntax used to import submodules throughout the library. More specifically, imports in the form of

import { Foo } from "./bar"

should be changed to

import { Foo } from "./bar/index.js"

Fix

This problem is fixed by changing the directory imports to proper equivalent file imports. Also, this path adds post-build hook (scripts/postbuild-cjs and scripts/postbuild-esm) that adds package.json for both CommonJS and ES Module libraries so that Node.js can know which import syntax is used.