feat: 增加RAG知识库与文档基础骨架

src/main/java/com/bruce/rag/service/IRagDocumentService.java

@@ -0,0 +1,7 @@
+package com.bruce.rag.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.bruce.rag.entity.RagDocument;
+
+public interface IRagDocumentService extends IService<RagDocument> {
+}