- Add status ENUM('active','disabled','deleted') to 8 tables
- Change all physical DELETE to UPDATE status='deleted'
- All SELECT queries filter by status='active'
- toggleActive now alternates between active/disabled status
- Exceptions: monitoring_history, rate_limits, sessions keep physical purge
- audit_logs remains immutable
- New migration 003_teams.sql: teams, team_user, team_server tables
- New Team model with CRUD, members, and server assignment
- New TeamController with full team management
- New views: teams/index, teams/create, teams/show
- Server model: getUserRole and getAccessibleServerIds now include team-based access
- Sidebar: Teams link under Administration (admin+ only)
- Routes: old /team routes removed, new /teams routes added
- Removed old ServerController team methods and views
- Fixed sidebar empty accessible IDs returning all servers
- Fixed dashboard and API to show empty when no accessible servers
