feat(scanner): add library stats to DB (#4229)

* Combine library stats migrations

* test: verify full library stats

* Fix total_songs calculation

* Fix library stats migration

* fix(scanner): log elapsed time and number of libraries updated during scan

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(scanner): refresh library stats conditionally, only if changes were detected

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(scanner): refresh library stats conditionally, only if changes were detected

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(scanner): update queries to exclude missing entries in library stats

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>

model/library.go

@@ -14,6 +14,14 @@ type Library struct {
 	FullScanInProgress bool
 	UpdatedAt          time.Time
 	CreatedAt          time.Time
+
+	TotalSongs        int
+	TotalAlbums       int
+	TotalArtists      int
+	TotalFolders      int
+	TotalFiles        int
+	TotalMissingFiles int
+	TotalSize         int64
 }
 
 type Libraries []Library
@@ -32,4 +40,5 @@ type LibraryRepository interface {
 	ScanBegin(id int, fullScan bool) error
 	ScanEnd(id int) error
 	ScanInProgress() (bool, error)
+	RefreshStats(id int) error
 }