rag_refresh: parse OWUI files-list {items:[...]} shape; unfiltered list + client-side name filter

rag_refresh.py

@@ -77,7 +77,9 @@ for name in DOCS:
         continue
 
     # delete stale file rows with this name, then upload fresh + attach
-    code, files = api(f"/api/v1/files/?name={name}")
+    code, files = api("/api/v1/files/?page=1")
+    if code == 200 and isinstance(files, dict):
+        files = files.get("items", [])  # OWUI returns {items: [...]}
     if code == 200 and isinstance(files, list):
         for f in files:
             if f.get("filename") == name: