Add three documentation files for the posts module:
- `api.md`: public API reference (list, slug, categories, images)
- `admin-api.md`: admin API reference with all CRUD endpoints
- `integration.md`: Next.js integration examples with code snippets
Update all references across source files, documentation, and
configuration to reflect the new package scope and name. This includes
updating `.npmrc` registry config, install instructions, module
examples, and all import path comments throughout the codebase.
hykocx