- StartupInfoPrinter 클래스 추가 - 서비스 시작 시 배너 출력

- MessageCode 채널 필드 @Deprecated 추가 및 기본값 설정
- MessageCode 신규 생성자 추가 - channel 파라미터 제거

src/main/java/com/eactive/apim/portal/config/StartupInfoPrinter.java

@@ -0,0 +1,51 @@
+package com.eactive.apim.portal.config;
+
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.boot.system.ApplicationPid;
+import org.springframework.context.ApplicationListener;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+/**
+ * Prints a startup banner to stdout once boot is complete.
+ *
+ * <p>Uses {@link System#out} directly (not a logger) so the info is shown even when
+ * the logback console appender is disabled (CONSOLE_LOG_ENABLED=false).
+ */
+@Component
+public class StartupInfoPrinter implements ApplicationListener<ApplicationReadyEvent> {
+
+    @Override
+    public void onApplicationEvent(ApplicationReadyEvent event) {
+        Environment env = event.getApplicationContext().getEnvironment();
+
+        String port = env.getProperty("server.port", "8080");
+        String contextPath = env.getProperty("server.servlet.context-path", "/");
+        if (!contextPath.startsWith("/")) {
+            contextPath = "/" + contextPath;
+        }
+        String url = "http://localhost:" + port + contextPath;
+
+        String[] active = env.getActiveProfiles();
+        String profile = active.length == 0
+                ? String.join(", ", env.getDefaultProfiles())
+                : String.join(", ", active);
+
+        String instanceName = env.getProperty("inst.Name", System.getProperty("inst.Name", "unknown"));
+        String pid = new ApplicationPid().toString();
+
+        StringBuilder sb = new StringBuilder();
+        sb.append(System.lineSeparator());
+        sb.append("=====================================================").append(System.lineSeparator());
+        sb.append("  EAPIM Portal - startup complete").append(System.lineSeparator());
+        sb.append("=====================================================").append(System.lineSeparator());
+        sb.append("  URL            : ").append(url).append(System.lineSeparator());
+        sb.append("  Spring profile : ").append(profile).append(System.lineSeparator());
+        sb.append("  Instance name  : ").append(instanceName).append(System.lineSeparator());
+        sb.append("  PID            : ").append(pid).append(System.lineSeparator());
+        sb.append("=====================================================").append(System.lineSeparator());
+
+        System.out.println(sb);
+        System.out.flush();
+    }
+}