feat: 新增命令行配置、优先级最高.

src/main/java/com/serliunx/ddns/config/AbstractConfiguration.java

@@ -20,7 +20,7 @@ public abstract class AbstractConfiguration implements Configuration {
 
     protected final Logger log = LoggerFactory.getLogger(this.getClass());
     protected final Map<String, String> valueMap = new LinkedHashMap<>(16);
-    private final Lock loadLock = new ReentrantLock();
+    protected final Lock loadLock = new ReentrantLock();
 
     public AbstractConfiguration() {}