AUTH-006: Organizations - Overseer UI Tab

[lbedner]

Priority: Medium | Estimate: L

Add Organizations tab to Auth Service modal in dashboard:

• Table of orgs (name, slug, plan, member count, actions)
• Expandable rows showing members
• Add/remove member actions
• Role change actions (promote/demote)
• Create org button

Files

• aegis/templates/.../app/components/frontend/dashboard/modals/auth_orgs_tab.py (new)
• aegis/templates/.../app/components/frontend/dashboard/modals/auth_modal.py (add tab)
• aegis/templates/.../app/components/frontend/dashboard/modals/auth_users_tab.py (add Org column)

Acceptance Criteria

• Organizations tab shows org list
• Can expand to see members
• Can manage members (add/remove/change role)
• Users tab shows which org(s) each user belongs to
• Tab only appears when auth_level is org