feat : Map -> DTO 컨버터

1. 기본모드 (느슨함, 필드 없으면 그냥 null)
2. 스트릭트모드 (엄격함, 필드 안맞으면 익셉션)
3. 가독 (세번째 파라미터가 뭔지 들어가전에 알수 없어서 헬퍼 매서드 추가)

src/main/java/egovframework/exception/DtoConvertException.java

@@ -0,0 +1,7 @@
+package egovframework.exception;
+
+public class DtoConvertException extends RuntimeException {
+    public DtoConvertException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/egovframework/util/DtoConverter.java

@@ -0,0 +1,53 @@
+package egovframework.util;
+
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.ObjectReader;
+import egovframework.exception.DtoConvertException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.util.Map;
+
+@Component
+@RequiredArgsConstructor
+public class DtoConverter {
+
+    private final ObjectMapper objectMapper;
+
+    /**
+     * Map<String, Object> → DTO 변환
+     * unknown 필드 허용
+     */
+    public <T> T toDto(Map<String, Object> body, Class<T> clazz) {
+        return toDto(body, clazz, false);
+    }
+
+
+
+
+    /**
+     * strict모드 가독 헬퍼
+     * */
+    public <T> T toStrictDto(Map<String, Object> body, Class<T> clazz) {
+        return toDto(body, clazz, true);
+    }
+
+    /**
+     * Map<String, Object> → DTO 변환
+     * @param strict true > unknown 필드에 대한 예외 발생
+     */
+    public <T> T toDto(Map<String, Object> body, Class<T> clazz, boolean strict) {
+        try {
+            ObjectReader reader = objectMapper.readerFor(clazz);
+            if (strict) {
+                reader = reader.with(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
+            }
+            return reader.readValue(objectMapper.writeValueAsBytes(body));
+        } catch (IOException e) {
+            throw new DtoConvertException("DTO 변환 실패: " + clazz.getSimpleName(), e);
+        }
+    }
+
+}