Fix frontend connection: use relative API path

rag_with_memory.py

@@ -53,7 +53,7 @@ class MemoryRAG:
             self.db = Chroma.from_documents(
                 chunks, 
                 embeddings, 
-                persist_directory="./tmp/chroma_db"
+                persist_directory="./chroma_db"
             )
 
             # 3. LLM Setup