Create rag_service.py

src/services/rag_service.py

@@ -0,0 +1,13 @@
+from typing import List, Optional
+
+class RAGService:
+    def __init__(self):
+        self.vectorstore = None
+    
+    def is_ready(self) -> bool:
+        return self.vectorstore is not None
+    
+    async def hybrid_search(self, query: str, top_k: int = 7) -> List:
+        """Placeholder for hybrid search"""
+        # Will implement FAISS + BM25 here
+        return []