Fix Qdrant Client Compatibility and Role RAG Tests

- Upgrade qdrant-client usage to query_points (replacing deprecated search)
- Relax qdrant-client version constraint in requirements.txt (>=1.7.0)
- Config: Allow extra environment variables in Settings (for local dev)
- test_roles_rag.py: Fix import path for local execution

app/utils/rag_chat.py

@@ -72,12 +72,13 @@ class RAGChatService:
                 if collection_name not in existing_collections:
                     continue
 
-                # Search in Qdrant
-                search_results = self.qdrant.search(
+                # Search in Qdrant using new Query API
+                response = self.qdrant.query_points(
                     collection_name=collection_name,
-                    query_vector=query_embedding,
+                    query=query_embedding,
                     limit=limit
                 )
+                search_results = response.points
 
                 # Format results
                 for hit in search_results: