goldenChat base source add

backend/src/main/java/com/goldenchart/config/AdminUserInitializer.java

@@ -0,0 +1,22 @@
+package com.goldenchart.config;
+
+import com.goldenchart.service.AuthService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+@Slf4j
+public class AdminUserInitializer implements ApplicationRunner {
+
+    private final AuthService authService;
+
+    @Override
+    public void run(ApplicationArguments args) {
+        authService.ensureDefaultAdmin();
+        log.info("[Auth] default admin user ensured (username=admin)");
+    }
+}