System Settings Migration:
- Add GetSystemSetting query for single setting retrieval
- Add UpdateSystemSetting query for updating settings
- Add GetAllSystemSettings query for all settings
- Remove UpdateScanSettings and GetScanSettings (per-user queries)
User Query Enhancement:
- Add max_devices field to GetUser query
- Add device_count computed field to GetUser query
- Add max_devices field to ListUsers query
- Add device_count computed field to ListUsers query
These changes support:
1. System-wide scan settings instead of per-user settings
2. Users can now see their device count and limits
3. Admins can monitor device usage across all users
john-okeefe
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