539bec6f63
Add privacy settings allowing users to control visibility of their followers, following, posts, and favorites lists with three visibility levels: everyone, following, and self. Also implement account deletion workflow with 30-day cooldown period. - Add PrivacySettings model with visibility levels - Add DTOs for privacy settings and account deletion - Add repository methods for privacy settings and deletion - Add service methods to check visibility permissions - Add handlers for get/update privacy settings and account deletion - Add new routes for privacy settings and account management - Add account cleanup service for hard-deleting expired accounts - Modify login to cancel deletion when user logs in BREAKING CHANGE: Users with pending_deletion status can no longer log in; logging in now automatically cancels deletion requests.