Admin Search: Fix pagination and status display issues

[bencorrado]

Fixed the following issues in the admin search functionality:

1. Added pagination support for email searches:

   • Modified backend to support pagination for email search results
   • Updated frontend to handle paginated email search results

2. Fixed status display issues:

   • Added code to fetch device status data for search results
   • Ensured InfluxDB status data (days online, status) is displayed for search results
   • Fixed Nebula IP and expiration display for search results

3. Improved loading state:

   • Added loading spinner during searches
   • Fixed 'No devices found' message showing prematurely during searches

All changes have been tested and are working correctly.