add server pinger

src/main/java/cc/fascinated/config/Config.java

@@ -1,20 +0,0 @@
-package cc.fascinated.config;
-
-import jakarta.annotation.PostConstruct;
-import lombok.Getter;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.context.annotation.Configuration;
-
-@Configuration
-@Getter
-public class Config {
-    public static Config INSTANCE;
-
-    @Value("${public-url}")
-    private String webPublicUrl;
-
-    @PostConstruct
-    public void onInitialize() {
-        INSTANCE = this;
-    }
-}