feat(rag): add document parsing structures

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

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