feat: add DevOptimizeDB flag to control SQLite optimization

Added a new DevOptimizeDB configuration flag (default true) that controls
whether SQLite PRAGMA OPTIMIZE and ANALYZE commands are executed. This allows
disabling database optimization operations for debugging or testing purposes.

The flag guards optimization commands in:
- db/db.go: Initial connection, post-migration, and shutdown optimization
- persistence/library_repository.go: Post-scan optimization
- db/migrations/migration.go: ANALYZE during forced full rescans

Set ND_DEVOPTIMIZEDB=false to disable all database optimization commands.

db/migrations/migration.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/consts"
 )
 
@@ -21,11 +22,13 @@ func notice(tx *sql.Tx, msg string) {
 // Call this in migrations that requires a full rescan
 func forceFullRescan(tx *sql.Tx) error {
 	// If a full scan is required, most probably the query optimizer is outdated, so we run `analyze`.
-	_, err := tx.Exec(`ANALYZE;`)
-	if err != nil {
-		return err
+	if conf.Server.DevOptimizeDB {
+		_, err := tx.Exec(`ANALYZE;`)
+		if err != nil {
+			return err
+		}
 	}
-	_, err = tx.Exec(fmt.Sprintf(`
+	_, err := tx.Exec(fmt.Sprintf(`
 INSERT OR REPLACE into property (id, value) values ('%s', '1');
 `, consts.FullScanAfterMigrationFlagKey))
 	return err