Add dual-source blog system with Editor.js integration:
- Blog storage supporting repo-based (JSON) and database sources
- Admin panel with rich text editor using Editor.js
- Public news page with infinite scroll
- Individual blog post viewer page
- Categories management in admin
- Image upload functionality
- 4 SEO blog posts about WordPress with PluginCompass promotion
- 3 News blog posts about Plugin Compass
- API endpoints for CRUD operations
- Security and validation for admin operations
Closes blog feature request
