feat(wordcloud): WordCloudJob 模型/迁移 + 词云生成与轮询适配器

src/wordcloud/wordcloud.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { WordCloudController } from './wordcloud.controller';
+import { WordCloudService } from './wordcloud.service';
+
+@Module({
+  controllers: [WordCloudController],
+  providers: [WordCloudService],
+})
+export class WordCloudModule {}