feat: add email verification

src/main/java/com/openisle/controller/GlobalExceptionHandler.java

@@ -0,0 +1,17 @@
+package com.openisle.controller;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.util.Map;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<?> handleException(Exception ex) {
+        return ResponseEntity.badRequest().body(Map.of("error", ex.getMessage()));
+    }
+}
+