feat: 代码生成适配多语言后端

src/main/java/com/youlai/boot/platform/codegen/model/vo/CodegenPreviewVO.java

@@ -16,4 +16,10 @@ public class CodegenPreviewVO {
     @Schema(description = "生成文件内容")
     private String content;
 
+    @Schema(description = "文件范围(frontend/backend)")
+    private String scope;
+
+    @Schema(description = "文件语言(扩展名)")
+    private String language;
+
 }

src/main/java/com/youlai/boot/platform/codegen/service/impl/CodegenServiceImpl.java

@@ -168,6 +168,8 @@ public class CodegenServiceImpl implements CodegenService {
             // 文件名 UserController.java
             String fileName = getFileName(entityName, templateName, extension);
             previewVo.setFileName(fileName);
+            previewVo.setScope(resolveScope(templateName));
+            previewVo.setLanguage(resolveLanguage(fileName));
 
             /* 2. 生成文件路径 */
             // 包名：com.youlai.boot
@@ -198,6 +200,17 @@ public class CodegenServiceImpl implements CodegenService {
         return list;
     }
 
+    private String resolveScope(String templateName) {
+        return switch (templateName) {
+            case "API", "API_TYPES", "VIEW" -> "frontend";
+            default -> "backend";
+        };
+    }
+
+    private String resolveLanguage(String fileName) {
+        return FileNameUtil.extName(fileName).toLowerCase();
+    }
+
     /**
      * 生成文件名。
      *