docs: update README for npm release

[Mornieur]

Pull Request

Summary

Updates the project README to reflect the first public npm release of FeitozaUI.

The documentation now includes:

• official npm installation instructions for @feitoza-ui/core;
• updated project introduction describing the library as a published package;
• current public component catalog;
• refreshed project status and roadmap;
• documentation adjustments to match the v0.3.0 release.

No runtime behavior, public APIs, package metadata, or source code were changed.

Type

• Documentation
• Chore
• Fix
• Feature
• Refactor
• Test

Scope

• README
• Installation documentation
• Public component catalog
• Project status
• Roadmap
• Documentation

Validation

• README reviewed for consistency
• Installation commands verified
• Public component list matches current exports
• Internal links reviewed

Checklist

• The change is scoped and reviewable.
• Documentation was updated when behavior or process changed.
• Public API changes are intentional and documented.
• Accessibility was considered when UI behavior changed.
• No secrets or generated artifacts were committed.

Notes

This PR is documentation-only and follows the v0.3.0 release.

No source code, package metadata, tests, or build configuration were modified.