fix: restore Qdrant search in Admin UI (use query_points) & dedup collections

app/routers/admin_vectors.py

@@ -56,13 +56,13 @@ def search_vectors(
         query_vector = embedding_service.embed_texts([query])[0]
         
         # 2. Search Qdrant directly
-        results = qdrant_client.search(
+        results = qdrant_client.query_points(
             collection_name=collection,
-            query_vector=query_vector,
+            query=query_vector,
             limit=limit,
             with_payload=True,
             with_vectors=False
-        )
+        ).points
         
         # 3. Format
         formatted = []
@@ -146,6 +146,8 @@ def list_collections(user = Depends(current_user)):
     client = get_qdrant_client()
     try:
         collections = client.get_collections()
-        return {"collections": [c.name for c in collections.collections]}
+        # Deduplicate and sort
+        names = sorted(list(set([c.name for c in collections.collections])))
+        return {"collections": names}
     except Exception as e:
         return {"error": str(e), "collections": []}