fixing ruff suggestions and tests needed updating.

tests/conftest.py

@@ -53,7 +53,7 @@ def sample_reranked():
 def mock_nats_message():
     """Create a mock NATS message."""
     msg = MagicMock()
-    msg.subject = "ai.chat.request"
+    msg.subject = "ai.chat.user.test-user-1.message"
     msg.reply = "ai.chat.response.test-123"
     return msg
 
@@ -63,7 +63,13 @@ def mock_chat_request():
     """Sample chat request payload."""
     return {
         "request_id": "test-request-123",
-        "query": "What is machine learning?",
+        "user_id": "test-user-1",
+        "username": "testuser",
+        "message": "What is machine learning?",
+        "premium": True,
+        "enable_rag": True,
+        "enable_reranker": True,
+        "enable_streaming": False,
         "collection": "test_collection",
         "enable_tts": False,
         "system_prompt": None,
@@ -75,7 +81,13 @@ def mock_chat_request_with_tts():
     """Sample chat request with TTS enabled."""
     return {
         "request_id": "test-request-456",
-        "query": "Tell me about AI",
+        "user_id": "test-user-2",
+        "username": "testuser2",
+        "message": "Tell me about AI",
+        "premium": True,
+        "enable_rag": True,
+        "enable_reranker": True,
+        "enable_streaming": False,
         "collection": "documents",
         "enable_tts": True,
         "system_prompt": "You are a helpful assistant.",