Drop subcategory column from database schema and update constraints
Remove subcategory handling from backend queries and API endpoints
Clean up frontend components and admin views to reflect the change
Add created/updated tracking and edit logs to all wiki tables
Restrict create/update/delete operations to verified users
Display edit metadata on frontend detail and list views
Add registration, login, and logout flows with session management
Integrate Resend for email verification tokens
Create frontend auth views and update topbar state
