Add comment to SQLite blank import

internal/database/database.go

@@ -10,7 +10,7 @@ import (
 	"sneak.berlin/go/pixa/internal/config"
 	"sneak.berlin/go/pixa/internal/logger"
 
-	_ "modernc.org/sqlite"
+	_ "modernc.org/sqlite" // SQLite driver registration
 )
 
 // Params defines dependencies for Database.