fix(metrics): update SQLite driver usage in MetricsDB initialization

- Changed the SQLite driver from "sqlite3" to "sqlite" in the NewMetricsDB function for improved compatibility with the new driver.
- This change aligns with the recent dependency update to modernc.org/sqlite, enhancing performance and stability.

internal/models/metrics.go

@@ -46,7 +46,7 @@ type MetricsDB struct {
 }
 
 func NewMetricsDB(dbPath string) (*MetricsDB, error) {
-	db, err := sql.Open("sqlite3", dbPath)
+	db, err := sql.Open("sqlite", dbPath)
 	if err != nil {
 		return nil, err
 	}