- Add avatarPath String? column to User model (migration: add_user_avatar)
- POST /users/me/avatar: 2MB limit, image/png/jpeg/webp allowlist, writes to user-files/avatars/{userId}.{ext}
- GET /users/me/avatar: streams avatar with Cache-Control: no-store
- AuthService.getMe(): returns isLocalUser + hasAvatar without leaking passwordHash/ldapDn
- AuthController GET /auth/me: now returns enriched profile via getMe()
