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/services/rag_service.py

@@ -336,12 +336,13 @@ class RAGService:
         # Generate query embedding
         query_embedding = self.embedding_service.embed_texts([query])[0]
 
-        # 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
         results = []