fix bd

.env.example

@@ -20,6 +20,16 @@ DEFAULT_LLM_BASE_URL=http://host.docker.internal:1234/v1
 DEFAULT_LLM_API_KEY=dummy
 DEFAULT_LLM_MODEL=local-model
 
+# === Default embeddings / RAG (overridable via admin panel) ===
+# provider: "hash" (offline fallback, no semantic quality) or "openai" (real /embeddings endpoint).
+# When provider=openai and base_url/api_key are empty, they fall back to the LLM settings above.
+DEFAULT_EMBEDDING_PROVIDER=hash
+DEFAULT_EMBEDDING_BASE_URL=
+DEFAULT_EMBEDDING_API_KEY=
+DEFAULT_EMBEDDING_MODEL=text-embedding-3-small
+DEFAULT_EMBEDDING_DIM=0
+DEFAULT_EMBEDDING_REQUEST_TIMEOUT=60
+
 # === Frontend ===
 VITE_API_URL=http://localhost:8000
 FRONTEND_BUILD_TARGET=dev