feat: Adding file metadata to hybrid search (#19095)

* Added metadata to hybrid search

* And config and env plus refac

* consistency

---------

Co-authored-by: Tim Baek <tim@openwebui.com>

backend/open_webui/config.py

@@ -2622,6 +2622,13 @@ ENABLE_RAG_HYBRID_SEARCH = PersistentConfig(
     os.environ.get("ENABLE_RAG_HYBRID_SEARCH", "").lower() == "true",
 )
 
+ENABLE_RAG_HYBRID_SEARCH_ENRICHED_TEXTS = PersistentConfig(
+    "ENABLE_RAG_HYBRID_SEARCH_ENRICHED_TEXTS",
+    "rag.enable_hybrid_search_enriched_texts",
+    os.environ.get("ENABLE_RAG_HYBRID_SEARCH_ENRICHED_TEXTS", "False").lower()
+    == "true",
+)
+
 RAG_FULL_CONTEXT = PersistentConfig(
     "RAG_FULL_CONTEXT",
     "rag.full_context",