Add monitoring dashboard for Plex backup system

- Created a new script `monitor-plex-backup.sh` for real-time status and health monitoring of the Plex backup system.
- Implemented features to check system status, backup status, performance metrics, recent activity, scheduling status, and health recommendations.
- Added command line options for watch mode and refresh interval.
- Enhanced logging with color-coded output for better visibility.

Update recent additions script to include more metadata

- Modified `plex-recent-additions.sh` to retrieve additional metadata fields such as year and library section type from the Plex database.
- Improved SQL query to join with library_sections for better context on added items.

Introduce comprehensive test suite for Plex backup system

- Added `test-plex-backup.sh` to provide automated testing for all backup-related functionality.
- Implemented unit tests for JSON log initialization, performance tracking, notification system, checksum caching, backup verification, and more.
- Included setup and cleanup functions for a mock test environment.
- Added performance benchmarks for checksum calculation and compression.
- Generated detailed test reports in JSON format for better tracking of test results.

plex-recent-additions.sh

@@ -14,10 +14,16 @@ sqlite3 "$PLEX_DB" <<EOF
 .headers on
 .mode column
 SELECT
-    datetime(added_at, 'unixepoch', 'localtime') AS "Added On",
-    title AS "Title",
-    (SELECT name FROM library_sections WHERE library_sections.id = library_section_id) AS "Library"
-FROM metadata_items
-WHERE added_at >= strftime('%s', 'now', '-7 days')
-ORDER BY added_at DESC;
+    datetime(meta.added_at, 'unixepoch', 'localtime') AS "added_at"
+    , meta.title
+    , meta.year
+    , lib.section_type AS "library_section_type"
+    , lib.name as "library_name"
+FROM
+    metadata_items meta
+    left join library_sections lib on meta.library_section_id = lib.id
+WHERE
+    meta.added_at >= strftime('%s', 'now', '-7 days')
+
+ORDER BY meta.added_at DESC;
 EOF