feat: Add base HTML template and implement dashboard, logs, and service views

- Created a base HTML template for consistent layout across pages.
- Developed a dashboard page to display backup service metrics and statuses.
- Implemented a log viewer for detailed log file inspection.
- Added error handling page for better user experience during failures.
- Introduced service detail page to show specific service metrics and actions.
- Enhanced log filtering and viewing capabilities.
- Integrated auto-refresh functionality for real-time updates on metrics.
- Created integration and unit test scripts for backup metrics functionality.

metrics/media-services_status.json

@@ -0,0 +1,17 @@
+{
+  "service": "media-services",
+  "description": "Media services backup (Sonarr, Radarr, etc.) - Remote servers",
+  "backup_path": "/mnt/share/media/backups",
+  "status": "partial",
+  "start_time": "2025-06-18T01:30:00-04:00",
+  "start_timestamp": 1750235400,
+  "end_time": "2025-06-18T01:32:45-04:00",
+  "end_timestamp": 1750235565,
+  "duration_seconds": 165,
+  "current_operation": "Remote services - check individual service URLs",
+  "files_processed": 0,
+  "total_size_bytes": 0,
+  "message": "Media services are running on remote servers. Access them directly via their individual URLs. Local backup may be limited.",
+  "last_updated": "2025-06-18T01:32:45-04:00",
+  "hostname": "book"
+}