chore: add IDE helper annotations to Eloquent models
Add @property, @property-read, @method, and @mixin PHPDoc annotations
to the seven core Eloquent models for IDE autocompletion support.
Models annotated:
- Workspace: all columns, relationships, scopes (active, ordered)
- User: all columns, relationships, factory
- WorkspaceMember: relationship props, scope methods (forWorkspace, forUser, withRole, inTeam, owners)
- WorkspaceInvitation: all columns, relationships, scopes (pending, expired, accepted)
- Namespace_: all columns, relationships, scopes (active, ordered, ownedByUser, ownedByWorkspace, accessibleBy)
- Package: all columns, relationships, scopes (active, public, base, addons, purchasable, free, ordered)
- Feature: all columns, relationships, scopes (active, inCategory, root)
Fixes #31
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>