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/db.go

@@ -45,10 +45,12 @@ func Db() *sql.DB {
 		if err != nil {
 			log.Fatal("Error opening database", err)
 		}
-		_, err = db.Exec("PRAGMA optimize=0x10002")
-		if err != nil {
-			log.Error("Error applying PRAGMA optimize", err)
-			return nil
+		if conf.Server.DevOptimizeDB {
+			_, err = db.Exec("PRAGMA optimize=0x10002")
+			if err != nil {
+				log.Error("Error applying PRAGMA optimize", err)
+				return nil
+			}
 		}
 		return db
 	})
@@ -99,7 +101,7 @@ func Init(ctx context.Context) func() {
 		log.Fatal(ctx, "Failed to apply new migrations", err)
 	}
 
-	if hasSchemaChanges {
+	if hasSchemaChanges && conf.Server.DevOptimizeDB {
 		log.Debug(ctx, "Applying PRAGMA optimize after schema changes")
 		_, err = db.ExecContext(ctx, "PRAGMA optimize")
 		if err != nil {
@@ -114,6 +116,9 @@ func Init(ctx context.Context) func() {
 
 // Optimize runs PRAGMA optimize on each connection in the pool
 func Optimize(ctx context.Context) {
+	if !conf.Server.DevOptimizeDB {
+		return
+	}
 	numConns := Db().Stats().OpenConnections
 	if numConns == 0 {
 		log.Debug(ctx, "No open connections to optimize")