Case-Sensitive Import Path Causes Build Failure on Linux

[changshengee]

In ttlock_flutter/lib/ttlock.dart (line 5), the import statement:
import 'package:ttlock_flutter/ttremoteKey.dart';
does not match the actual filename ttremotekey.dart (lowercase).

This causes a build failure on Linux (case-sensitive filesystems) while working fine on Windows (case-insensitive).