[WIP] Improve event logging for admin side

[Copilot]

Event Logging Enhancements

Implementing comprehensive event logging for admin visibility into system activities.

Plan

• Add scan event logging table for Sonarr/Radarr library sync operations
• Log scan start, completion, and statistics (shows/movies processed, duration)
• Extend api_usage table to include prompt/query text for LLM operations
• Create admin view to display scan event logs
• Enhance existing webhook activity display in admin panel
• Update API usage logs view to show query details
• Add filtering and search capabilities for all event logs
• Test all logging functionality

Original prompt

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This section details on the original issue you should resolve

<issue_title>Logging events</issue_title>
<issue_description>The admin side needs better event logging. I would like to see when scans happen when webhooks are triggered. We have show event logging from plex and LLM reports for usage (cost and processing time), but these should also include the details of the query)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Logging events #25

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